DS 8000 Copy Services Environment

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IBM System Storage DS8000: Copy Services in Open EnvironmentsConfiguration of Copy Services in heterogeneous environments New IBM FlashCopy SE

TPC for Replication support Copy Services with System i

Bert Dufrasne Wilhelm Gardt Jana Jamsek Peter Kimmel Jukka Myyrylainen

Markus Oscheka Gerhard Pieper Stephen West Axel Westphal Roland Wolf

ibm.com/redbooks

International Technical Support Organization IBM System Storage DS8000: Copy Services in Open Environments May 2008

SG24-6788-03

Note: Before using this information and the product it supports, read the information in Notices on page xvii.

Fourth Edition (May 2008) This edition applies to the IBM System Storage DS8000 with Licensed Machine Code 5.30xx.xx, as announced on October 23, 2007.

Copyright International Business Machines Corporation 2004-2008. All rights reserved. Note to U.S. Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

ContentsNotices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix The team that wrote this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix Special thanks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxi Become a published author . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii Comments welcome. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxii Summary of changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii May 2008, Fourth Edition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xxiii Part 1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Chapter 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Point-in-time copy functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 Remote Mirror and Copy functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Chapter 2. Copy Services architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1 Introduction to the Copy Services structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.1 Management console defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.2 Storage Unit defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.3 Storage Facility Image (SFI) defined. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.4 Storage Complex defined . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 The structure of Copy Services management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2.1 Communication path for Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2.2 Remote Mirror and Copy between Storage Complexes . . . . . . . . . . . . . . . . . . . . 14 2.2.3 Differences between the DS CLI and the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . 14 Chapter 3. Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Licenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Authorized level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.1 Licensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2.2 Charging example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 18 22 22 22

Part 2. Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Chapter 4. DS Storage Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 4.1 Accessing the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.2 Access capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Chapter 5. DS Command-Line Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1 Introduction and functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 Supported operating systems for the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3 User accounts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.4 DS CLI profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 Command structure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 Copy Services commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7 Using the DS CLI application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.1 Single-shot mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 32 32 33 33 34 35 37 37

Copyright IBM Corp. 2004-2008. All rights reserved.

iii

5.7.2 Script command mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.7.3 Interactive mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.8 Return codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.9 User assistance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.10 Usage examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 6. IBM TotalStorage Productivity Center for Replication . . . . . . . . . . . . . . . . 6.1 IBM TotalStorage Productivity Center . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.2 Where we are coming from . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 What TPC for Replication provides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4 Copy Services terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.1 FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.2 IBM FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.3 Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.4 Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.5 Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.6 Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.4.7 Failover/failback terminology. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 TPC for Replication terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6 Volumes in a copy set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.1 Host volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.2 Target volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.3 Journal volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.4 Intermediate volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.5 TPC for Replication copy set. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.6.6 TPC for Replication session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7 TPC for Replication session types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7.1 TPC for Replication Basic License . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.7.2 TPC for Replication Two Site Business Continuity . . . . . . . . . . . . . . . . . . . . . . . . 6.7.3 TPC for Replication Three Site Business Continuity. . . . . . . . . . . . . . . . . . . . . . . 6.8 TPC for Replication session states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.9 TPC for Replication and scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.10 TPC for Replication system and connectivity overview. . . . . . . . . . . . . . . . . . . . . . . . 6.11 TPC for Replication monitoring and freeze capability . . . . . . . . . . . . . . . . . . . . . . . . . 6.12 TPC for Replication heartbeat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.13 Supported platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.14 Hardware requirements for TPC for Replication servers. . . . . . . . . . . . . . . . . . . . . . . 6.15 TPC for Replication GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.1 Connecting to the TPC for Replication GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.2 Health Overview panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.3 Sessions panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.4 Storage Subsystems panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.5 Path Management panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.6 TPC for Replication server Configuration panel . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.7 Advanced Tools panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.15.8 Console log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.16 Command line interface to TPC for Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

38 39 39 40 41 43 44 45 45 47 47 47 47 48 48 48 49 50 50 50 51 51 51 51 52 54 54 54 55 55 56 57 61 62 63 64 64 66 67 68 70 72 73 74 75 75

Part 3. FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 Chapter 7. FlashCopy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1 FlashCopy operational environments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2 Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3 Basic concepts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ivIBM System Storage DS8000: Copy Services in Open Environments

79 80 81 81

7.3.1 Full volume copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.2 Nocopy option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 FlashCopy in combination with other Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.1 FlashCopy and Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.2 FlashCopy and Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.3 FlashCopy and Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5 FlashCopy in a DS8300 storage LPAR environment . . . . . . . . . . . . . . . . . . . . . . . . . .

85 86 87 87 88 89 90

Chapter 8. FlashCopy options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 8.1 Multiple Relationship FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92 8.2 Consistency Group FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 8.3 FlashCopy target as a Metro Mirror or Global Copy primary. . . . . . . . . . . . . . . . . . . . . 93 8.4 Incremental FlashCopy refresh target volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94 8.5 Remote FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 8.6 Persistent FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 8.7 Reverse restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 8.8 Fast reverse restore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 8.9 FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.9.1 Multiple Relationship FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.9.2 Consistency Group FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.9.3 FlashCopy SE target as a Metro Mirror or Global Copy primary. . . . . . . . . . . . . . 99 8.9.4 Remote FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.9.5 Persistent FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99 8.9.6 Reverse restore and fast reverse restore of FlashCopy SE relations . . . . . . . . . 100 8.10 Options and interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 Chapter 9. FlashCopy interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.1 FlashCopy management interfaces: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2 DS CLI and DS GUI: Commands and options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2.1 Local FlashCopy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2.2 Remote FlashCopy management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3 Local FlashCopy using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3.1 Parameters used with local FlashCopy commands . . . . . . . . . . . . . . . . . . . . . . 9.3.2 Local FlashCopy commands: Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.3.3 FlashCopy Consistency Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4 Remote FlashCopy using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4.1 Remote FlashCopy commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4.2 Parameters used in remote FlashCopy commands . . . . . . . . . . . . . . . . . . . . . . 9.5 FlashCopy management using the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5.1 Initiating FlashCopy using Create . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5.2 Displaying properties of existing FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5.3 Reversing existing FlashCopy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5.4 Initiating background copy for a persistent FlashCopy relationship . . . . . . . . . . 9.5.5 Resynchronizing target . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.5.6 Deleting existing FlashCopy relationship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 10. IBM FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1 IBM FlashCopy SE overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2 Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3 Repository for Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3.1 Capacity planning for FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3.2 Creating a repository for Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . 10.3.3 Creation of Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.4 Performing FlashCopy SE operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Contents

101 102 103 103 104 104 105 106 115 116 116 117 118 119 121 125 126 127 128 129 130 131 132 133 135 138 140 v

10.4.1 10.4.2 10.4.3 10.4.4 10.4.5

Creation and resynchronization of FlashCopy SE relationships . . . . . . . . . . . . Removing FlashCopy relationships and releasing space . . . . . . . . . . . . . . . . . Other FlashCopy SE operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Working with Space Efficient volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Monitoring repository space and out-of-space conditions. . . . . . . . . . . . . . . . .

140 145 148 149 149 153 154 154 155 156 156 156 157 159 161 161 161 162 162 163 165 166 166 166 167 167 168 168 169

Chapter 11. FlashCopy performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 FlashCopy performance overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1.1 Distribution of the workload: Location of source and target volumes . . . . . . . . 11.1.2 LSS/LCU versus rank: Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1.3 Rank characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 FlashCopy establish performance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.3 Background copy performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.4 FlashCopy impact on applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.5 Performance planning for IBM FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6 FlashCopy scenarios. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.1 Scenario #1: Backup to disk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.2 Scenario #2: Backup to tape . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.3 Scenario #3: IBM FlashCopy SE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.6.4 Scenario #4: FlashCopy during peak application activity . . . . . . . . . . . . . . . . . 11.6.5 Scenario #5: Ranks reserved for FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 12. FlashCopy examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1 Creating a test system or integration system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1.1 One-time test system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.1.2 Multiple setup of a test system with the same contents . . . . . . . . . . . . . . . . . . 12.2 Creating a backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2.1 Creating a FlashCopy for backup purposes without volume copy . . . . . . . . . . 12.2.2 Using IBM FlashCopy SE for backup purposes . . . . . . . . . . . . . . . . . . . . . . . . 12.2.3 Incremental FlashCopy for backup purposes . . . . . . . . . . . . . . . . . . . . . . . . . . 12.2.4 Using a target volume to restore its contents back to the source . . . . . . . . . . .

Part 4. Metro Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Chapter 13. Metro Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.1 Metro Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 Metro Mirror volume state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.3 Data consistency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.4 Rolling disaster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.5 Automation and management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 14. Metro Mirror options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 14.1 Basic Metro Mirror operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.2 Open systems: Clustering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.3 Failover and failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4 Consistency Group function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4.1 Data consistency and dependent writes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.4.2 Consistency Group function: How it works . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5 Metro Mirror paths and links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5.1 Fibre Channel links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.5.2 Logical paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.6 Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.7 LSS design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.8 Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 174 175 175 176 176 177 178 179 179 180 181 182 185 186 187 188 188 188

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14.9 Symmetrical configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189 14.10 Volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 14.11 Hardware requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190 Chapter 15. Metro Mirror performance and scalability . . . . . . . . . . . . . . . . . . . . . . . . 15.1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.1.1 Managing the load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.1.2 Initial synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.2 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 16. Metro Mirror interfaces and examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.1 Metro Mirror interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.2 Copy Services network components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.3 DS Command-Line Interface (DS CLI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.4 DS Storage Manager GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5 Setting up a Metro Mirror environment using the DS CLI . . . . . . . . . . . . . . . . . . . . . 16.5.1 Preparing to work with the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5.2 Setup of the Metro Mirror configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5.3 Determining the available Fibre Channel links . . . . . . . . . . . . . . . . . . . . . . . . . 16.5.4 Creating Metro Mirror paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5.5 Creating Metro Mirror pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.6 Removing Metro Mirror environment using DS CLI. . . . . . . . . . . . . . . . . . . . . . . . . . 16.6.1 Step 1: Remove Metro Mirror pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.6.2 Step 2: Remove paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.7 Managing the Metro Mirror environment with the DS CLI . . . . . . . . . . . . . . . . . . . . . 16.7.1 Suspending and resuming Metro Mirror data transfer. . . . . . . . . . . . . . . . . . . . 16.7.2 Adding and removing paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.8 Failover and Failback functions for sites switching . . . . . . . . . . . . . . . . . . . . . . . . . . 16.8.1 Metro Mirror Failover function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.8.2 Metro Mirror Failback function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.9 Freezepprc and unfreezepprc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10 DS Storage Manager GUI examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.1 Creating paths. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.2 Adding paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.3 Changing options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.4 Deleting paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.5 Creating volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.6 Suspending volume pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.7 Resuming volume pairs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.8 Metro Mirror Failover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.10.9 Metro Mirror Failback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193 194 194 194 195 197 198 199 200 201 201 202 202 203 204 204 206 206 207 209 209 210 212 212 216 221 224 224 229 233 234 236 241 242 244 246

Part 5. Global Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Chapter 17. Global Copy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.1 Global Copy overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.2 Volume states and change logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.3 Global Copy positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 18. Global Copy options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1 Global Copy basic options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1.1 Establishing a Global Copy pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1.2 Suspending a Global Copy Pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1.3 Resuming a Global Copy Pair. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 254 255 256 257 258 258 258 259

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18.1.4 Terminating a Global Copy Pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1.5 Converting a Global Copy pair to Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . 18.2 Creating a consistent point-in-time copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.2.1 Procedure to take a consistent point-in-time copy . . . . . . . . . . . . . . . . . . . . . . 18.2.2 Making a FlashCopy at the remote site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.3 Hardware requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.4 Global Copy connectivity: Paths and links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.4.1 Global Copy Fibre Channel links. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.4.2 Logical paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.5 Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.6 LSS design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.7 Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.8 DS8000 configuration at the remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 19. Global Copy interfaces and examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.1 Global Copy interfaces: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.2 Copy Services network components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.3 Using DS CLI examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.3.1 Setting up a Global Copy environment using the DS CLI . . . . . . . . . . . . . . . . . 19.3.2 Remove Global Copy environment using DS CLI . . . . . . . . . . . . . . . . . . . . . . . 19.3.3 Maintaining the Global Copy environment using the DS CLI . . . . . . . . . . . . . . 19.3.4 Periodic off-site backup procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.4 DS Storage Manager GUI examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.4.1 Establish paths with the DS Storage Manager GUI . . . . . . . . . . . . . . . . . . . . . 19.4.2 Establishing Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.4.3 Monitoring the copy status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.4.4 Converting to Metro Mirror (synchronous) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19.4.5 Suspending a pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 20. Global Copy performance and scalability . . . . . . . . . . . . . . . . . . . . . . . . 20.1 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.2 Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.2.1 Adding capacity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20.2.2 Capacity for existing versus new systems . . . . . . . . . . . . . . . . . . . . . . . . . . . .

259 259 259 260 261 262 263 263 263 263 264 264 265 267 268 269 270 270 273 276 280 286 286 290 294 295 296 299 300 300 300 300

Part 6. Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 Chapter 21. Global Mirror overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.1 Synchronous and non-synchronous data replication . . . . . . . . . . . . . . . . . . . . . . . . 21.1.1 Synchronous data replication and dependent writes . . . . . . . . . . . . . . . . . . . . 21.1.2 Asynchronous data replication and dependent writes. . . . . . . . . . . . . . . . . . . . 21.2 Basic concepts of Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3 Setting up a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.1 Simple configuration to start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.2 Establishing connectivity to remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.3 Creating Global Copy relationships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.4 Introducing FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.5 Defining the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.3.6 Populating the Global Mirror session with volumes . . . . . . . . . . . . . . . . . . . . . 21.3.7 Starting the Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4 Consistency Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4.1 Consistency Group formation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21.4.2 Consistency Group parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 304 304 308 312 313 314 314 315 316 317 318 319 319 320 321

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Part 7. Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323 Chapter 22. Global Mirror options and configuration . . . . . . . . . . . . . . . . . . . . . . . . . 22.1 Terminology used in Global Mirror environments . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.2 Creating a Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3 Modifying a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3.1 Adding or removing volumes to the Global Mirror session . . . . . . . . . . . . . . . . 22.3.2 Adding or removing storage disk subsystems or LSSs. . . . . . . . . . . . . . . . . . . 22.3.3 Modifing the Global Mirror session parameters . . . . . . . . . . . . . . . . . . . . . . . . 22.3.4 Global Mirror environment topology changes . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3.5 Removing FlashCopy relationships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.3.6 Removing the Global Mirror environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.4 Global Mirror with multiple storage disk subsystems . . . . . . . . . . . . . . . . . . . . . . . . 22.5 Recovery scenario after production site failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.1 Normal Global Mirror operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.2 Production site failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.3 Global Copy Failover from B to A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.4 Verifying for valid Consistency Group state . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.5 Setting consistent data on B volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.6 Re-establishing FlashCopy relationships between B and C . . . . . . . . . . . . . . . 22.5.7 Restarting the application at the remote site. . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.8 Preparing to switch back to the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.9 Returning to the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22.5.10 Conclusions of failover/failback example . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 23. Global Mirror interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.1 Global Mirror interfaces: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.2 DS Command-Line Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.3 DS Storage Manager GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.4 TotalStorage Productivity Center for Replication (TPC-R) . . . . . . . . . . . . . . . . . . . . Chapter 24. Global Mirror performance and scalability. . . . . . . . . . . . . . . . . . . . . . . . 24.1 Performance aspects for Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.2 Performance considerations at coordination time . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.3 Consistency Group drain time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.4 Remote storage disk subsystem configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.5 Balancing the disk subsystem configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.6 Growth within Global Mirror configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 25. Global Mirror examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1 Setting up a Global Mirror environment using the DS CLI . . . . . . . . . . . . . . . . . . . . 25.1.1 Preparing to work with the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1.2 Configuration used for the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1.3 Setup procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.1.4 Creating Global Copy relationships: A to B volumes . . . . . . . . . . . . . . . . . . . . 25.1.5 Creating FlashCopy relationships: B to C volumes. . . . . . . . . . . . . . . . . . . . . . 25.1.6 Starting Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2 Removing a Global Mirror environment with the DS CLI. . . . . . . . . . . . . . . . . . . . . . 25.2.1 Ending Global Mirror processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2.2 Removing the A volumes from the Global Mirror session . . . . . . . . . . . . . . . . . 25.2.3 Removing the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2.4 Terminating FlashCopy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.2.5 Terminating Global Copy pairs and remove the paths . . . . . . . . . . . . . . . . . . . 25.3 Managing the Global Mirror environment with the DS CLI . . . . . . . . . . . . . . . . . . . .Contents

325 326 327 329 329 330 330 331 331 332 332 336 336 337 338 338 342 343 344 344 345 348 349 350 351 353 355 357 358 359 361 361 364 365 367 368 368 368 369 369 370 371 377 378 379 380 380 381 382 ix

25.3.1 Pausing and resuming Global Mirror Consistency Group formation . . . . . . . . . 25.3.2 Changing the Global Mirror tuning parameters . . . . . . . . . . . . . . . . . . . . . . . . . 25.3.3 Stopping and starting Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.3.4 Adding and removing A volumes to the Global Mirror environment . . . . . . . . . 25.3.5 Adding and removing an LSS to an existing Global Mirror environment. . . . . . 25.3.6 Adding and removing a subordinate disk subsystem . . . . . . . . . . . . . . . . . . . . 25.4 Recovery scenario after local site failure with the DS CLI. . . . . . . . . . . . . . . . . . . . . 25.4.1 Stopping Global Mirror processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4.2 Performing Global Copy Failover from B to A . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4.3 Verifying for valid Consistency Group state . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4.4 Reversing FlashCopy from B to C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4.5 Re-establishing the FlashCopy relationship from B to C. . . . . . . . . . . . . . . . . . 25.4.6 Restarting the application at the remote site. . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5 Returning to the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.1 Creating paths from B to A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.2 Performing Global Copy Failback from B to A . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.3 Querying for the Global Copy first pass completion . . . . . . . . . . . . . . . . . . . . . 25.5.4 Quiescing the application at the remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.5 Querying the Out Of Sync Tracks until the result shows zero. . . . . . . . . . . . . . 25.5.6 Creating paths from A to B if they do not exist . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.7 Performing Global Copy Failover from A to B . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.8 Performing Global Copy Failback from A to B . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.9 Starting Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.5.10 Starting the application at the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6 Practicing disaster recovery readiness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.1 Querying the Global Mirror environment to look at the situation . . . . . . . . . . . . 25.6.2 Pausing Global Mirror and checking its completion . . . . . . . . . . . . . . . . . . . . . 25.6.3 Pausing Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.4 Performing Global Copy Failover from B to A . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.5 Creating consistent data on B volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.6 Waiting for the FlashCopy background copy to complete. . . . . . . . . . . . . . . . . 25.6.7 Re-establishing the FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.8 Taking FlashCopy from B to D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.6.9 Performing the disaster recovery testing using the D volume. . . . . . . . . . . . . . 25.6.10 Performing Global Copy Failback from A to B . . . . . . . . . . . . . . . . . . . . . . . . 25.6.11 Waiting for the Global Copy first pass to complete . . . . . . . . . . . . . . . . . . . . . 25.6.12 Resuming Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.7 DS Storage Manager GUI: Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8 Setting up a Global Mirror environment using the DS GUI . . . . . . . . . . . . . . . . . . . . 25.8.1 Defining paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8.2 Creating Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8.3 Creating FlashCopy relationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.8.4 Creating the Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.9 Managing the Global Mirror environment with the DS GUI . . . . . . . . . . . . . . . . . . . . 25.9.1 Viewing settings and error information of the Global Mirror session. . . . . . . . . 25.9.2 Viewing information of volumes in the Global Mirror session . . . . . . . . . . . . . . 25.9.3 Pausing a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.9.4 Resuming a Global Mirror session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.9.5 Modifying a Global Mirror session. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

382 385 385 387 389 391 391 392 393 394 396 399 400 400 401 401 403 404 404 404 405 406 407 409 409 410 410 411 411 412 412 412 413 414 414 416 416 417 418 418 422 427 431 435 435 437 437 438 439

Part 8. Metro/Global Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441 Chapter 26. Metro/Global Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443

x


26.1 Metro/Global Mirror overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.1.1 Metro Mirror and Global Mirror: Comparison . . . . . . . . . . . . . . . . . . . . . . . . . . 26.1.2 Metro/Global Mirror design objectives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26.2 Metro/Global Mirror processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 27. Configuration and setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1 Metro/Global Mirror configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.1.1 Metro/Global Mirror with additional Global Mirror . . . . . . . . . . . . . . . . . . . . . . . 27.1.2 Metro/Global Mirror with multiple storage subsystems . . . . . . . . . . . . . . . . . . . 27.2 Configuration examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3 Initial setup of Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3.1 Identifying the PPRC ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3.2 Step 1: Set up all Metro Mirror and Global Mirror paths . . . . . . . . . . . . . . . . . . 27.3.3 Step 2: Set up Global Copy NOCOPY from intermediate to remote sites . . . . 27.3.4 Step 3: Set up Metro Mirror between local and intermediate sites . . . . . . . . . . 27.3.5 Step 4: Set up FlashCopy at remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.3.6 Step 5: Create Global Mirror session and add volumes to session . . . . . . . . . 27.3.7 Step 6: Start Global Mirror at intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . 27.4 Going from Metro Mirror to Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27.5 Recommendations for setting up Metro/Global Mirror. . . . . . . . . . . . . . . . . . . . . . . . Chapter 28. General Metro/Global Mirror operations. . . . . . . . . . . . . . . . . . . . . . . . . . 28.1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.2 General considerations for storage failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.3 Checking pair status before failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.4 Freezing and unfreezing Metro Mirror volumes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.5 Suspending volumes before failover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.6 Removing volumes from the session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.7 Checking consistency at the remote site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28.8 Setting up an additional Global Mirror from remote site . . . . . . . . . . . . . . . . . . . . . . 28.8.1 Step 1: Create Global Copy from remote to intermediate site . . . . . . . . . . . . . 28.8.2 Step 2: Create FlashCopy at the intermediate site . . . . . . . . . . . . . . . . . . . . . . 28.8.3 Step 3: Create session and Global Mirror at remote site . . . . . . . . . . . . . . . . . Chapter 29. Planned recovery scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.2 Recovery at intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.2.1 Step 1: Stop the production application at the local site . . . . . . . . . . . . . . . . . . 29.2.2 Step 2: Suspend the Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.2.3 Step 3: Failover the intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.2.4 Step 4: Start the production application at the intermediate site. . . . . . . . . . . . 29.3 Return to local from intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.3.1 Step 1: Stop I/O at the intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.3.2 Step 2: Terminate Global Mirror or remove volumes from the session. . . . . . . 29.3.3 Step 3: Suspend Global Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.3.4 Step 4: Fail back Metro Mirror to local site and wait for Full Duplex . . . . . . . . . 29.3.5 Steps 5 and 6: Suspend Metro Mirror and fail over to the local site . . . . . . . . . 29.3.6 Step 7: Fail back Metro Mirror from the local site to the intermediate site . . . . 29.3.7 Step 8: Resume Global Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.3.8 Step 9: Start I/O at the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.3.9 Step 10: Start Global Mirror or add volumes to the session . . . . . . . . . . . . . . . 29.4 Recovery at remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.4.1 Step 1: Stop I/O at the local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.4.2 Step 2: Terminate Global Mirror or remove volumes from session. . . . . . . . . .Contents

444 444 445 445 449 450 450 451 451 453 454 454 456 456 457 458 458 461 462 463 464 464 464 466 467 468 468 472 473 473 474 475 476 476 477 477 478 479 480 481 481 481 482 482 483 483 484 484 484 485 486 xi

29.4.3 Step 3: Terminate Global Copy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.4.4 Step 4: Suspend Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.4.5 Step 5: Fail over Metro Mirror to intermediate site . . . . . . . . . . . . . . . . . . . . . . 29.4.6 Step 6: Establish Global Copy from remote to intermediate site. . . . . . . . . . . . 29.4.7 Step 7: Start I/O at the remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5 Return from remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5.1 Step 1: Stop I/O at remote site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5.2 Step 2: Fail back Metro Mirror from the intermediate site to the local site . . . . 29.5.3 Step 3: Terminate Global Copy from remote to intermediate site . . . . . . . . . . . 29.5.4 Step 4: Suspend Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5.5 Step 5: Fail over to local site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5.6 Step 6: Fail back Metro Mirror from the local site to the intermediate site . . . . 29.5.7 Step 7: Create Global Copy from intermediate to remote site . . . . . . . . . . . . . 29.5.8 Step 8: Start I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29.5.9 Step 9: Start Global Mirror or add volumes to the session . . . . . . . . . . . . . . . . Chapter 30. Disaster recovery test scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.2 Disaster recovery test at the intermediate site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.2.1 Step 1: Prepare the failover for disaster recovery test . . . . . . . . . . . . . . . . . . . 30.2.2 Step 2: Set up FlashCopy to the additional volumes . . . . . . . . . . . . . . . . . . . . 30.2.3 Step 3: Set up PPRC paths from the local site to the intermediate site . . . . . . 30.2.4 Step 4: Resume Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30.2.5 Step 5: Start I/O on the disaster recovery host . . . . . . . . . . . . . . . . . . . . . . . . . 30.3 Disaster recovery test at remote site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 31. Unplanned scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.2 Server outages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3 Link failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3.1 Metro Mirror link failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.3.2 Global Copy link failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.4 Partial disasters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.5 Data center outages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 32. MGM Incremental Resync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1.1 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.1.2 Options for DSCLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.2 Setting up Metro/Global Mirror with Incremental Resync . . . . . . . . . . . . . . . . . . . . . 32.2.1 Setup of Incremental Resync Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . 32.2.2 Going from Global Mirror to Incremental Resync Metro/Global Mirror . . . . . . . 32.3 Failure at the local site scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3.1 Local site fails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3.2 Local site is back. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.3.3 Returning to the original configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.4 Failure at the intermediate site scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.4.1 Intermediate site failure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.4.2 Intermediate site is back . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.4.3 Re-synchronization at intermediate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32.4.4 Restoring the original configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

486 487 487 488 488 489 490 490 491 491 491 492 492 493 493 495 496 496 497 498 499 499 500 500 503 504 504 505 505 506 506 509 511 512 512 514 515 515 516 522 523 525 531 540 541 545 548 550

Chapter 33. Metro/Global Mirror with IBM TotalStorage Productivity Center for Replication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 557 xiiIBM System Storage DS8000: Copy Services in Open Environments

33.1 Metro/Global Mirror: Additional references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2 Metro/Global Mirror scenario. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2.1 Creating a session for Metro/Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33.2.2 Creating paths for the Metro/Global Mirror session . . . . . . . . . . . . . . . . . . . . . 33.2.3 Adding Copy Sets to the Metro/Global Mirror session . . . . . . . . . . . . . . . . . . . 33.2.4 Managing Metro/Global Mirror through the GUI . . . . . . . . . . . . . . . . . . . . . . . . 33.2.5 Disaster Recovery with TPC-R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chapter 34. MGC Incremental Resync . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.2 Creating a Global Copy relationship between B and C . . . . . . . . . . . . . . . . . . . . 34.3 Modifying an existing Metro Mirror relationship. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.4 Suspending Metro Mirror between A and B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.5 Failover from C to B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34.6 Incremental resync from A to C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

558 558 559 564 568 573 575 581 582 582 583 584 584 584

Part 9. Copy Services with System i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585 Chapter 35. Copy Services with System i5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2 System i5 functions and external storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.1 System i5 structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.2 Single-level storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.3 Input Output Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.4 Clusters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.2.5 Independent Auxiliary Storage Pools (IASPs). . . . . . . . . . . . . . . . . . . . . . . . . . 35.3 Metro Mirror for an IASP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.3.5 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4 Global Mirror for an IASP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.4.5 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5 Metro Mirror for the entire disk space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.5.5 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6 Global Mirror for the entire disk space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.6.5 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7 FlashCopy of IASP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Contents

587 588 589 589 590 590 591 593 595 595 596 597 598 599 622 622 623 624 624 625 627 627 628 628 629 629 637 637 638 639 639 640 644 645 646 646 xiii

35.7.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.7.5 Using Metro Mirror and FlashCopy of IASP in the same scenario . . . . . . . . . . 35.7.6 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8 FlashCopy of the entire disk space . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8.1 Solution description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8.2 Solution benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8.3 Planning and requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8.4 Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.8.5 Implementation and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9 FlashCopy SE with System i partition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.1 Overview of FlashCopy SE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.2 Scenario and usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.3 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.4 Sizing for FlashCopy SE repository . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.5 Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.9.6 Monitor use of repository space with workload CPW . . . . . . . . . . . . . . . . . . . . 35.9.7 System behavior with a repository full condition . . . . . . . . . . . . . . . . . . . . . . . . 35.10 TPC for Replication with Global Mirror for i5/OS. . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.1 Planning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.2 Accessing the TPC-R GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.3 Create a TPC-R session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.4 Add Copy Sets to the TPC-R session . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.5 Start Global Mirror. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.6 Switch to Remote site at planned outages . . . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.7 Switch to Remote site at unplanned outages . . . . . . . . . . . . . . . . . . . . . . . . . 35.10.8 Fail back to local site. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

646 647 647 650 650 651 652 652 652 656 656 656 657 658 661 668 671 675 675 676 676 678 683 685 688 688

Part 10. Interoperability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 689 Chapter 36. Data migration through double cascading. . . . . . . . . . . . . . . . . . . . . . . . 691 36.1 Data migration with double cascading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 692 36.2 Double cascading example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 692 Chapter 37. Interoperability between DS8000 and ESS 800 . . . . . . . . . . . . . . . . . . . . 37.1 DS8000 and ESS 800 Copy Services interoperability . . . . . . . . . . . . . . . . . . . . . . . 37.2 Preparing the environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.1 Minimum microcode levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.2 Hardware and licensing requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.3 Network connectivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.4 Create matching user IDs and passwords . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.5 Updating the DS CLI profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.6 Adding the Copy Services Domain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.7 Volume size considerations for RMC (PPRC). . . . . . . . . . . . . . . . . . . . . . . . . . 37.2.8 Volume address considerations on the ESS 800 . . . . . . . . . . . . . . . . . . . . . . . 37.2.9 Establishment errors on newly created volumes. . . . . . . . . . . . . . . . . . . . . . . . 37.3 RMC: Establishing paths between DS8000 and ESS 800 . . . . . . . . . . . . . . . . . . . . 37.3.1 Decoding port IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.3.2 Path creation using the DS GUI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.3.3 Establish logical paths between DS8000 and ESS 800 using DS CLI . . . . . . . 37.4 Managing Metro Mirror or Global Copy pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.4.1 Managing Metro Mirror or Global Copy pairs using the DS GUI . . . . . . . . . . . . 37.4.2 Managing Metro Mirror pairs using the DS CLI. . . . . . . . . . . . . . . . . . . . . . . . . 37.4.3 Managing Global Copy pairs using the DS CLI. . . . . . . . . . . . . . . . . . . . . . . . . 37.5 Managing ESS 800 Global Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xivIBM System Storage DS8000: Copy Services in Open Environments

695 696 696 696 696 696 697 697 698 699 703 703 703 704 704 707 710 710 714 715 715

37.5.1 Managing Global Mirror pairs using the DS CLI . . . . . . . . . . . . . . . . . . . . . . . . 37.6 Managing ESS 800 FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37.6.1 Creating an ESS 800 FlashCopy using the DS GUI . . . . . . . . . . . . . . . . . . . . . 37.6.2 Creating an ESS 800 FlashCopy using DS CLI . . . . . . . . . . . . . . . . . . . . . . . . 37.6.3 Creating a remote FlashCopy on an ESS 800 using DS CLI . . . . . . . . . . . . . . Chapter 38. Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1 IBM Tivoli Storage Manager for Advanced Copy Services . . . . . . . . . . . . . . . . . . . . 38.1.1 TSM for Advanced Copy Services Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1.2 TSM for Advanced Copy Services Backup . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1.3 TSM for Advanced Copy Services Restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.1.4 Cloning of an SAP environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.2 HACMP/XD for Metro Mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38.3 Geographically Dispersed Open Clusters (GDOC) . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix A. Open systems specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Database and file system specifics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . File system consistency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Database consistency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIX specifics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIX and FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AIX and Remote Mirror and Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Windows and Remote Mirror and Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copy services with Windows volumes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Microsoft Volume Shadow Copy Services (VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Microsoft Virtual Disk Service (VDS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SUN Solaris and Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FlashCopy without a volume manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote copy without a Volume Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copy Services using VERITAS Volume Manager. . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP-UX and Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP-UX and FlashCopy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . HP-UX with Remote Mirror and Copy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VMware Virtual Infrastructure and Copy Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Virtual machine considerations regarding Copy Services. . . . . . . . . . . . . . . . . . . . . . . Appendix B. SNMP notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SNMP overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Physical connection events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Remote Mirror and Copy events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Global Mirror related SNMP traps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Appendix C. CLI migration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Migrating ESS CLI to DS CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reviewing the ESS tasks to migrate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Converting the individual tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Related publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Other publications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Online resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . How to get IBM Redbooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Help from IBM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

716 716 717 718 719 721 722 722 723 723 723 725 726 729 730 730 731 732 732 736 738 739 741 744 749 749 750 750 753 754 755 757 757 765 766 766 768 768 773 774 774 776 781 781 781 782 782 783

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Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 785

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NoticesThis information was developed for products and services offered in the U.S.A. IBM may not offer the products, services, or features discussed in this document in other countries. Consult your local IBM representative for information on the products and services currently available in your area. Any reference to an IBM product, program, or service is not intended to state or imply that only that IBM product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any IBM intellectual property right may be used instead. However, it is the user's responsibility to evaluate and verify the operation of any non-IBM product, program, or service. IBM may have patents or pending patent applications covering subject matter described in this document. The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to: IBM Director of Licensing, IBM Corporation, North Castle Drive, Armonk, NY 10504-1785 U.S.A. The following paragraph does not apply to the United Kingdom or any other country where such provisions are inconsistent with local law: INTERNATIONAL BUSINESS MACHINES CORPORATION PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some states do not allow disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you. This information could include technical inaccuracies or typographical errors. Changes are periodically made to the information herein; these changes will be incorporated in new editions of the publication. IBM may make improvements and/or changes in the product(s) and/or the program(s) described in this publication at any time without notice. Any references in this information to non-IBM Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the materials for this IBM product and use of those Web sites is at your own risk. IBM may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. Information concerning non-IBM products was obtained from the suppliers of those products, their published announcements or other publicly available sources. IBM has not tested those products and cannot confirm the accuracy of performance, compatibility or any other claims related to non-IBM products. Questions on the capabilities of non-IBM products should be addressed to the suppliers of those products. This information contains examples of data and reports used in daily business operations. To illustrate them as completely as possible, the examples include the names of individuals, companies, brands, and products. All of these names are fictitious and any similarity to the names and addresses used by an actual business enterprise is entirely coincidental. COPYRIGHT LICENSE: This information contains sample application programs in source language, which illustrate programming techniques on various operating platforms. You may copy, modify, and distribute these sample programs in any form without payment to IBM, for the purposes of developing, using, marketing or distributing application programs conforming to the application programming interface for the operating platform for which the sample programs are written. These examples have not been thoroughly tested under all conditions. IBM, therefore, cannot guarantee or imply reliability, serviceability, or function of these programs.


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TrademarksIBM, the IBM logo, and ibm.com are trademarks or registered trademarks of International Business Machines Corporation in the United States, other countries, or both. These and other IBM trademarked terms are marked on their first occurrence in this information with the appropriate symbol ( or ), indicating US registered or common law trademarks owned by IBM at the time this information was published. Such trademarks may also be registered or common law trademarks in other countries. A current list of IBM trademarks is available on the Web at http://www.ibm.com/legal/copytrade.shtml The following terms are trademarks of the International Business Machines Corporation in the United States, other countries, or both:AIX AS/400 DB2 DS4000 DS6000 DS8000 Enterprise Storage Server ESCON eServer FICON FlashCopy GDPS HACMP HyperSwap IBM iSeries i5/OS NetView OS/400 POWER4 POWER5 Redbooks Redbooks (logo) S/390 System i System i5 System p System x System z System Storage System Storage DS Tivoli TotalStorage Virtualization Engine WebSphere z/OS zSeries

The following terms are trademarks of other companies: SAP, and SAP logos are trademarks or registered trademarks of SAP AG in Germany and in several other countries. SANsurfer, QLogic, and the QLogic logo are registered trademarks of QLogic Corporation. SANblade is a registered trademark in the United States. Oracle, JD Edwards, PeopleSoft, Siebel, and TopLink are registered trademarks of Oracle Corporation and/or its affiliates. Network Appliance, SnapMirror, and the NetApp logo are trademarks or registered trademarks of NetApp, Inc. in the U.S. and other countries. Disk Magic, and the IntelliMagic logo are trademarks of IntelliMagic BV in the United States, other countries, or both. Java, JDK, Solaris, Sun, and all Java-based trademarks are trademarks of Sun Microsystems, Inc. in the United States, other countries, or both. Excel, Internet Explorer, Microsoft, Windows NT, Windows Server, Windows, and the Windows logo are trademarks of Microsoft Corporation in the United States, other countries, or both. Intel, Pentium, Intel logo, Intel Inside logo, and Intel Centrino logo are trademarks or registered trademarks of Intel Corporation or its subsidiaries in the United States, other countries, or both. UNIX is a registered trademark of The Open Group in the United States and other countries. Linux is a trademark of Linus Torvalds in the United States, other countries, or both. Other company, product, or service names may be trademarks or service marks of others.

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PrefaceThis IBM Redbooks publication will help you install, tailor, and configure Copy Services for open systems environments on the IBM System Storage DS8000. It should be read in conjunction with The IBM System Storage DS8000 Series: Architecture and Implementation, SG24-6786. This book will help you design and implement a new Copy Services installation or migrate from an existing installation. It includes hints and tips to maximize the effectiveness of your installation. There is a companion book that supports the configuration of the Copy Services functions in a z/OS environment, The IBM System Storage DS8000 Series: Copy Services with IBM System z, SG24-6787.

The team that wrote this bookThis book was produced by a team of specialists from around the world working for the International Technical Support Organization, San Jose Center in IBM Mainz, Germany. Bertrand Dufrasne is an IBM Certified I/T Specialist and Project Leader for System Storage disk products at the International Technical Support Organization, San Jose Center. He has worked at IBM in various I/T areas. Bert has written many IBM Redbooks and has also developed and taught technical workshops. Before joining the ITSO, he worked for IBM Global Services as an Application Architect. He holds a degree in Electrical Engineering. Wilhelm Gardt holds a degree in Computer Sciences from the University of Kaiserslautern, Germany. He has worked as a software developer and IT specialist, designing and implementing heterogeneous IT environments (SAP, Oracle, AIX, HP-UX, SAN). In 2001, he joined the IBM TotalStorage Interoperability Centre (now Systems Lab Europe) in Mainz, Germany. He has performed many proof of concepts on IBM storage products. Since September 2004 he is a member of the Technical Pre-Sales Support team for IBM Storage (ATS). Jana Jamsek is IT specialist in IBM Slovenia. She works for Storage Advanced Technical Support in Europe and specializes in IBM Storage Systems and i5/OS systems. Jana has eight years of experience in the System i and AS/400 area, and six years experience in Storage. She holds a Masters degree in computer science and a degree in mathematics from University of Ljubljana, Slovenia. She has co-authored numerous IBM Redbooks publications for System i and IBM System Storage products, including the IBM System Storage DS8000, the IBM Virtualization Engine TS7510 and other tape offerings. Peter Kimmel is an IT Specialist with the Enterprise Disk ATS Performance team at the European Storage Competence Center in Mainz, Germany. He joined IBM Storage in 1999 and since then worked with SSA, VSS, the various ESS generations, and DS8000/DS6000. He has been involved in all Early Shipment Programs (ESPs) and early installs for the Copy Services rollouts. Peter holds a Diploma (MSc) degree in Physics from the University of Kaiserslautern.


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Jukka Myyrylainen is an Advisory IT Specialist with Integrated Technology Services, IBM Finland. He has several years of experience with storage product implementations on both System z and open systems platforms. He provides consultancy, technical support, and implementation services to customers for IBM's strategic storage hardware and software products. He has contributed to several storage-related IBM Redbooks publications in the past. Markus Oscheka is an IT Specialist for Proof of Concepts and Benchmarks at the ATS Customer Solutions team in Mainz, Germany. His areas of expertise include setup and demonstration of IBM System Storage products and solutions in various environments including AIX, Linux, Windows, HP-UX, and Solaris. He has worked at IBM for five years. He has performed many proof of concepts with Copy Services on DS6000/DS8000, as well as Performance-Benchmarks with DS4000/DS6000/DS8000. Gerhard Pieper is an IT Specialist for Open Systems Solutions at the Enterprise Disk team in Mainz, Germany. For 5 years, he has worked as last level support engineer for IBM High End Storage Products. His areas of expertise include test, implementation, support and documentation about IBM disk storage servers. His current focus is the implementation of management software for IBM Storage. Stephen West is a member of the IBM Americas Advanced Technical Support team for IBM disk storage products and related copy services. His primary focus has been the enterprise disk storage products, copy services and customer performance issues with these storage and copy products. A significant part of this job is to educate the technical team in the field on the storage and related copy services solutions. Prior to the new product or new release announcements, the ATS team is trained on the details of the new products and releases, and then develops education for field training sessions. Axel Westphal is working as an IT Specialist for Workshops and Proof of Concepts at the European Storage Competence Center (ESCC) in Mainz, Germany. Axel joined IBM in 1996, working for Global Services as a System Engineer. His areas of expertise include setup and demonstration of IBM System Storage products and solutions in various environments. Since 2004 he is responsible for Workshops and Proof of Concepts conducted at the ESSC with DS8000, SAN Volume Controller and IBM TotalStorage Productivity Center. Roland Wolf is a Certified Consulting IT Specialist in Germany. He has 21 years of experience with S/390 and disk storage hardware and since the last years also in SAN and storage for open systems. He is working in Field Technical Sales Support for storage systems. His areas of expertise include performance analysis and disaster recovery solutions in enterprises utilizing the unique capabilities and features of the IBM disk storage servers, ESS and DS6000/DS8000. He has contributed to various IBM Redbooks publications including, ESS, DS6000, and DS80000 Concepts and Architecture, and DS6000 / DS8000 Copy Services. He holds a Ph.D. in Theoretical Physics.

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The team: Wilhelm, Markus. Jukka, Peter, Jana, Steve, Bertrand, Gerhard, Roland, and Axel

Special thanksWe especially want to thank: John Bynum, DS8000 World Wide Technical Support Marketing Lead Rainer Zielonka and Rainer Erkens, for hosting us at the European Storage Competency Center in Mainz, Germany. They were able to supply us with the needed hardware, conference room, and all of the many things needed to run a successful residency. Gnter Schmitt and Uwe Schweikhard, for their help in reserving and preparing the equipment we used Many thanks to the authors of the previous edition of this book: Peter Kimmel, Jukka Myyrlainen, Lu Nguyen, Gero Schmidt, Shin Takata, Anthony Vandewerdt, and Bjoern Wesselbaum We also would like to thank: Selwyn Dickey,

DS 8000 Copy Services Environment

Documents

Transcript of DS 8000 Copy Services Environment