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New Features in EMC Enginuity 5874
for Symmetrix Open Systems Environments
A Detailed Review
Abstract
This white paper is an overview of the new features and functionality introduced with EnginuityTM 5874 forEMC® Symmetrix® environments.
May 2010
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Copyright © 2009, 2010 EMC Corporation. All rights reserved.
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All other trademarks used herein are the property of their respective owners.
Part Number h6202.1
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Table of Contents
Executive summary ............................................................................................4
Introduction.........................................................................................................4
Audience ...................................................................................................................................... 4
Tiered storage .....................................................................................................5
Enhanced Virtual LUN Technology.............................................................................................. 5
Virtual Provisioning enhancements ............................................................................................. 5
Provisioning and management..........................................................................5
Auto-provisioning Groups ............................................................................................................ 5
Concurrent provisioning ............................................................................................................... 6
512 hypers per physical drive ...................................................................................................... 7
Large volume support .................................................................................................................. 7
New management integration...................................................................................................... 7
Replication enhancements and additions ........................................................7
SRDF/Extended Distance Protection........................................................................................... 7
SRDF enhancements................................................................................................................... 8
Concurrent SRDF/S with independent consistency protection ................................................ 8 SRDF/A adding or removing devices ....................................................................................... 8 Remote TimeFinder/Clone to SRDF R1 restore ...................................................................... 9 SRDF timestamp for suspend/resume..................................................................................... 9 SRDF/Star with an R22 device................................................................................................. 9 250 SRDF groups................................................................................................................... 10
TimeFinder enhancements ........................................................................................................ 10
Cascaded TimeFinder/Clone.................................................................................................. 10 Snap Recreate ....................................................................................................................... 10
Open Replicator for Symmetrix enhancements......................................................................... 10
Cold push from a TimeFinder/Snap snapshot (VDEV) .......................................................... 10 iSeries support ....................................................................................................................... 11
Additional features ...........................................................................................11
Symmetrix Optimizer.................................................................................................................. 11
128 directors .............................................................................................................................. 11
Support for 2,400 drives............................................................................................................. 11
Metadata reduction .................................................................................................................... 11
Conclusion ........................................................................................................12
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Executive summaryThe EMC® Symmetrix® VMAX™ Series with Enginuity™ 5874 now delivers new software capabilitiesthat improve capacity utilization, ease of use, business continuity, and security.
The Enginuity storage operating environment provides the intelligence that controls all components in an
EMC Symmetrix storage array.
Enginuity is an intelligent, multi-tasking, preemptive storage operating environment (SOE) that controls
storage data flow. It is wholly devoted to storage operations and optimized for the service levels required in
high-end environments. While it shares many traits with the operating systems typically used to run largehost computers, Enginuity is more specialized and specifically optimized for storage-based functions. It is
driven by real-time events related to the input and output of data. It applies self-optimizing intelligence to
deliver the ultimate performance, availability, and data integrity required in a platform for advanced storagefunctionality. It ensures investment protection and consistency over time in technology and operational
processes and provides built-in security capabilities while insulating powerful storage applications from
technology changes. Enginuity manages data integrity through continuous checking of all data and
hardware—from host to memory to disk and back again. This includes trend analysis and early detection as
well as automatic failover and escalation when a problem does occur.
EMC is introducing a new product in the Symmetrix family, the Symmetrix VMAX Series with Enginuity5874. The new Symmetrix VMAX delivers the industry's first Virtual Matrix Architecture™, and
revolutionizes the high-end storage market to set Symmetrix apart from all other competitive offerings. Itcombines the ability to scale performance and capacity to unmatched levels with industry-proven support
for nondisruptive operations. These core capabilities allow users to efficiently support growth and maintain
service levels and are now combined with new capabilities purpose-built for the next generation Virtual
Data Center. Together, they enable IT organizations to further lower costs, simplify and automatemanagement, and protect more information. The system is powered by the Enginuity 5874 operating
environment to enable high-end functionality and data protection.
IntroductionThis white paper describes Enginuity 5874 features that help reduce cost and deliver service levels viascale-out and tiering, provide management abstraction to enable ease, speed and automation, and deliver
“24 x 7 x Forever” application availability.
Management of the features described in this white paper requires a minimum of EMC Solutions Enabler
7.0, while Symmetrix Management Console should be at least version 7.0. The focus of this white paper is
on new Enginuity 5874 features for open systems environments. For details of new features for mainframeenvironments see the white paper New Features in EMC Enginuity 5874 for Symmetrix Mainframe
Environments.
Audience
This white paper is intended for technology professionals who need to understand the new features enabled
by Enginuity 5874.
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Tiered storage
Enhanced Vir tual LUN Techno logy
In previous Enginuity versions, Symmetrix logical volumes could only support one RAID type per volume.
Also, some RAID types, RAID 1 and RAID 5, occupied two of the four available mirror positions for agiven volume. Enginuity 5874 introduces a new RAID implementation for Symmetrix known as RAID
Virtual Architecture (RVA). With RVA, each local RAID group is abstracted to a single mirror position.
Currently, two distinct RAID groups, a primary and a secondary, can be associated with a Symmetrixlogical volume. This new architecture enables improved flexibility with mirrors and protection schemes.
For example, drive sparing now can take place at the same time as concurrent SRDF. RVA also is the
foundation for Enhanced Virtual LUN Technology.
Virtual LUN technology, a feature of Symmetrix Optimizer, enables users to nondisruptively relocate
volumes to different tiers, and now to different RAID types, transparently to the host and without impactinglocal or remote replication. Organizations can respond more easily to changing business requirements
when using tiered storage in the array. Migrations can be performed to either configured or unconfigured
space. When migrating to configured space, the Symmetrix will choose from existing logical volumes tomigrate the data to. These target volumes may not be in use on the array prior to or during the migration.
Following the migration, data that may have existed on the target volumes will no longer be accessible.
Migrating to unconfigured space will create new hypers, from free space, to be used as the target of the
migration. Once the data transfer has been completed, the physical space previously associated with the
migrated volume will be returned to the free pool.
Vir tual Provis ioning enhancements
Thin pools now can be shrunk nondisruptively, helping reuse space to improve efficiency. When a data
device is disabled, it will first move data elsewhere in the pool by draining any active extents to other
enabled data devices in the thin storage pool. Once the draining is complete, that device (volume) is
disabled and can then be removed from the pool.
In addition to reusing space more efficiently, benefits of this capability include the ability to:
• Adjust the subscription ratio of a thin pool – that is, the total amount of host perceived capacity divided by the underlying total physical capacity
• Adjust the utilization or “percent full” of a thin pool
• Remove all data volumes from one or more physical drives, possibly in preparation for removal of
physical drives with a plan to replace them with higher capacity drives
Customers can virtually provision all tiers and RAID levels, and support local and remote replication forthin volumes and pools using any RAID type. This includes support for RAID 1, RAID 5 (3+1), RAID 5
(7+1), RAID 6 (6+2), and RAID 6 (14+2), as well as support for TimeFinder ®/Clone, TimeFinder/Snap,
SRDF®/A, SRDF/S, SRDF/DM, Open Replicator, and Open Migrator.
Provisioning and management
Auto-provis ioning Groups
The Auto-provisioning Groups feature provides an easier, faster way to provision storage in Symmetrix
VMAX storage arrays running Enginuity 5874. The majority of applications running on Symmetrix arrays
require a fault-tolerant environment with clustered hosts, as well as multiple paths to devices. Auto- provisioning Groups was developed to make storage allocation easier and faster by reducing labor and risk
of error, especially with these types of configurations.
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Storage provisioning in previous Enginuity versions required a separate command for each initiator/port
combination through which devices would be accessed. With Enginuity 5874, users can create a group of
devices (storage group), a group of director ports (port group), and a group of host initiators (initiator
group), and associate them in a masking view. When the masking view is created, the devices are
automatically mapped and masked and, thereby, accessible to the host(s).
Figure 1. Auto-provisioning Groups
After the masking view is created, any objects (devices, ports, or initiators) added to an existing group
automatically become part of the associated masking view. This means that no additional steps are
necessary to add additional devices, ports, or initiators to an existing configuration. All necessaryoperations to make them part of the configuration are handled automatically by Enginuity once the objects
are added to the applicable group. This reduces the number of commands needed for mapping and masking
devices and allows for easier storage allocation and de-allocation.
Use of the new Auto-provisioning Groups functionality requires the symaccess command available with
Solutions Enabler 7.0.
Concurrent provis ioning
A new feature in Enginuity 5874 provides the ability for multiple configuration changes to be executed
concurrently within the Symmetrix VMAX storage array, thereby improving efficiency. This concurrency
is possible provided that the configuration changes do not require the same resources. Resources will still be locked during the configuration changes, but concurrent changes can be submitted provided the targeted
resources are not locked. For example, a configuration change to add the SRDF attribute to a volume can
take place at the same time as a volume being mapped, provided that each operation is not being runagainst the same volume.
Examples of configuration changes that can take place concurrently include:
• Volume mapping
• Volume attribute changes
• Optimizer swap
• Virtual LUN migration
• Metavolume expansion
These changes will also be able to take place while maintenance scripts, such as Permanent MemberSparing or disk replacement, are running.
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512 hypers per ph ysic al dr ive
Previous versions of Enginuity supported a maximum of 256 hypers per physical drive. Starting with
Enginuity 5874 this value will be increased to a maximum of 512 hypers per physical drive. This enables
customers to improve flexibility and capacity utilization by configuring more granular volumes that meettheir space requirements, particularly when using high-capacity drives.
Large volum e sup por t
Prior to Enginuity 5874, the largest single logical volume that could be created on a Symmetrix was 65,520
cylinders, approximately 60 GB. Now, with Enginuity 5874, a logical volume can be configured up to a
maximum capacity of 262,668 cylinders, or approximately 240 GB, about four times as large as with
DMX-4. This simplifies storage management by reducing the need to create metavolumes and more easily
accommodating high-capacity and high-growth application requirements. Large volumes also reduce therisk that organizations will exceed their system's volume addressing limits.
New management integrat ion
Starting with Enginuity 5874, Symmetrix Management Console (SMC) is now available on the service
processor. By joining the service processor to the corporate network, storage administrators will have
immediate access to SMC from anywhere in the enterprise. Communication to the service processor willoccur over a secure, SSL/HTTPS connection. This support for out-of-band management reduces TCO by
eliminating the need for the customer to purchase an additional server to manage the Symmetrix with SMC
and/or SMI-S Providers.
Replication enhancements and additions
SRDF/Extended Distance Protect ion
Available with Enginuity 5874, SRDF/Extended Distance Protection (SRDF/EDP) is a new two-site
disaster restart solution that enables customers the ability to achieve no data loss at an out-of-region site at
a lower cost. Using cascaded SRDF as the building block for this solution, combined with the use of the
new diskless R21 data device at an intermediate (pass-through) site Symmetrix system, provides data pass-through to the out-of-region site using SRDF/A.
With Enginuity 5773, cascaded SRDF introduced a new SRDF R21 device. The R21 device assumed dual
roles of primary (R1) and secondary (R2) device types simultaneously. Data received by this device as a
secondary can automatically be transferred by this device as a primary.
Figure 2. SRDF/Extended Distance Protection
As with cascaded SRDF, an SRDF/EDP configuration consists of a primary site (Site A) replicating
synchronously to a secondary site (Site B) with SRDF/S, and then replicating the same data asynchronously
to a tertiary site (Site e C) with SRDF/A.
An R21 device has its own local mirrors so there are three full copies of data, one at each of the three sites.
In contrast, the diskless R21 device has no local disk space allocated to store the user data, therefore itreduces the cost of having disk storage in the secondary (R21) Symmetrix system. The purpose of a
diskless R21 device is to cascade data to the R2 device. When using a diskless R21 device, the changed
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tracks received on the R2 mirror are saved in cache until these tracks are sent to the R2 device. Once the
data is sent to the R2 device and the receipt is acknowledged, the cache slot is freed and the data no longer
exists on the R21 Symmetrix.
SRDF/EDP is for customers who are looking for a two-site DR solution with the ability to achieve a zero
recovery point objective (RPO) in the event of a primary site failure. To date, customers looking toestablish a two-site disaster recovery configuration with a zero RPO were bound by distance limitations due
to latency and application performance (Synchronous type replication). Also, if the business called for anextended distance replication solution (Asynchronous type replication) they would have to compromise
with some level of data loss (secs/mins). SRDF/EDP supports an RPO between the zero RPO of SRDF/Sand seconds to minutes of SRDF/A, offering customers a more cost-effective, optimal solution to a three-
site DR configuration.
The key benefits of SRDF/EDP to the customer are:
• New long-distance replication solution with the ability to achieve zero RPO at the tertiary site
• Lower-cost alternative in which to achieve no data loss for out-of-region disaster restart
• SRDF/Star differential relationship support between the tertiary site and the production site for failoveroperations with reverse SRDF/Asynchronous protection
Note: SRDF/EDP is supported within SRDF/Star environments, both concurrent and cascaded, with somelimitations. For more information on these limitations please see the EMC Solutions Enabler Symmetrix
SRDF Family CLI Version 7.0 Product Guide.
SRDF enhanc ements
Concurrent SRDF/S with independent consistency protection
RDF Enginuity Consistency Assist (RDF-ECA) provides consistency protection for synchronous mode
volumes by performing suspend operations across all SRDF/S volumes in a consistency group or a namedsubset of all volumes in a composite group. In Enginuity versions 5773 and earlier, in a concurrent SRDF
environment, RDF-ECA could only be enabled on a single link or on both links of the concurrent SRDFrelationship at the same time.
Enginuity 5874 allows for the definition of an independent RDF-ECA consistency group on each of the
links of a concurrent SRDF R1 volume, providing the ability to disable consistency protection on one link,
while still maintaining consistency on the second leg.
SRDF/A adding or removing devices
Prior to Enginuity 5874, adding a volume or volumes to, or removing from, an existing active SRDF/A
SRDF group required that all volumes in the group be taken out of asynchronous mode or suspended,
causing the SRDF/A session to be deactivated. Subsequently, after the volume has been added, all volumesin the SRDF group remain in a state of “syncinprog” until all invalid tracks for all volumes, including the
newly add volume(s), are cleared and two more cycle switches occur.
Newly introduced in Enginuity 5874 is the SRDF/A consistency exempt feature. This feature provides the
ability to dynamically add and remove volumes from an active SRDF/A session without affecting the state
of the SRDF/A session or the reporting of the SRDF pair state for each of the volumes in the active session
that are not the target of the add or remove operation. This is achieved by marking the volumes being addedor removed as “exempt” from being considered when calculating the consistency state of the volumes in
the SRDF/A session or when deciding if the SRDF/A session should be dropped to maintain dependentwrite consistency on the R2 side.
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Setting the consistency exempt flag on a volume allows the volume to be added or removed from an active
SRDF/A SRDF group using either a create, delete, or move operation without requiring the other volumes
in the SRDF group to be suspended prior to the operation.
Remote TimeFinder/Clone to SRDF R1 restore
In Enginuity 5773 and earlier, a SRDF restore operation could not be initiated if the R2 volume was the
target of a TimeFinder/Clone restore while the restore was in progress. The clone restore had to complete
prior to performing the SRDF restore. Starting with Enginuity 5874, the R2 volume can be used to restoreto its partnered R1 volume while a clone restore is in progress to the R2.
SRDF timestamp for suspend/resume
Enginuity 5874 introduces a new reporting field for SRDF volume pairs. When using Solutions Enabler7.0 to query an SRDF pair or SRDF device group, a timestamp will be reported indicating when the status
of the volume pair last changed. The current link status will indicate whether this last status change caused
data transfer to be suspended or resumed on the link. The time of last action will be reported regardless ofwhether the query was issued from the primary or secondary side of the SRDF connection.
SRDF/Star with an R22 deviceA new SRDF volume type is introduced in Enginuity 5874, a concurrent R2 (R22). A concurrent R2volume is one whose two remote mirrors are paired with a different R1 volume. However, only one of the
R2 mirrors may be receiving data from its corresponding volume containing the R1 mirror at any given
time. The primary intended use for an R22 volume is to simplify failover situations and improve resiliency
in SRDF/Star environments. With the introduction of the R22 volume, SRDF/Star setup can include thecreation of recovery volume pairings, thus negating the need to create these pairings during a SRDF/Star
switch event. The availability of an R22 volume also simplifies swap operations in cascaded SRDF
configurations.
Figure 3. SRDF/Star configurations with an R22 device
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250 SRDF groups
In Enginuity versions 5772 and 5773, SRDF groups could be assigned group numbers between 1 and 250,
with a maximum of 128 groups created per Symmetrix, and a maximum of 32 SRDF groups on any one
SRDF director. Enginuity 5874 now allows up to a maximum of 250 SRDF groups to be created, still
numbered between 1 and 250, with a maximum of 64 SRDF groups on any one SRDF capable director (RFor RE).
TimeFinder enhancements
Cascaded TimeFinder/Clone
As a new feature of Enginuity 5874, cascaded TimeFinder/Clone enables the ability to create and activateTimeFinder/Clone targets from a source device that is also a target volume of a separate TimeFinder/Clone
operation. This feature allows a BCV volume, using TimeFinder/Clone emulation, to be used as a source
volume for native clone operations, while also allowing for a BCV using clone emulation to be established
to the target of another native clone session.
Figure 4. Cascaded TimeFinder/Clone
When clone sessions exist between three different volumes, there are three possible combinations of nativeclone and clone emulation.
Table 1. Native clone and clone emulation combinations
Volume A to Volume B Volume B to Volume C Native TimeFinder/Clone Native TimeFinder/Clone
Native TimeFinder/Clone TimeFinder/Clone Emulation
TimeFinder/Clone Emulation Native TimeFinder/Clone
Snap Recreate
Prior to Enginuity 5874, taking a new point-in-time TimeFinder/Snap copy required terminating the
previously activated Snap session between the source volume and the target virtual volume (VDEV). Now,
following activation of a Snap session, if a new point-in-time image is requested, the session can be just be
recreated and then activated again. As the recreate will lead to the replacement of the old image on theVDEV, all used tracks in the SAVE pool associated with the previous session will be released.
Open Repl icator for Symmetr ix enhancements
Cold push from a TimeFinder/Snap snapshot (VDEV)
When Open Replicator was first introduced in Enginuity 5671, point-in-time BCV push operations, or cold pushes, were only allowed from full volume copies such as a TimeFinder/Mirror or TimeFinder/Clone
control volumes or by making the standard volume not ready. Now, with Enginuity 5874, an Open
Replicator cold push can be performed using a virtual space-saving TimeFinder/Snap snapshot volume
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(VDEV) as the control volume. This allows users to avoid the standard copy-on-first-write penalty
associated with performing a hot push from the Symmetrix, while utilizing space efficiently by not having
to take a full volume copy of the data being transferred, thereby minimizing host impact. This is
particularly important when users must keep applications online but don’t want or need a full physical copy
of the source just to perform the Open Replicator push operation.
iSeries supportOpen Replicator, with Enginuity 5874, now allows for the migration of AS400 volumes from older
Symmetrix DMX™ arrays (DMX-2, DMX-3, and DMX-4) to a Symmetrix VMAX storage array, or from
one Symmetrix VMAX to another. Operations allowed are:
• Hot pull, without donor update
• Hot pull, with donor update
• Cold pull
Open Replicator iSeries support allows for the migration of metavolumes with different configurations
between source and target.
Additional features
Symmetr ix Opt im izer
Starting with Enginuity 5874, Symmetrix Optimizer swaps will be performed at a device level, rather thanat the hyper level as had been used in previous Enginuity versions. Also, as a result of the implementation
of RAID Virtual Architecture, only one DRV is needed to swap a pair of Symmetrix volumes. As before,
the devices being swapped need to be of equal size and configuration, however, the DRV being used to provide device protection during the swap can be larger. This change means that a group of DRVs can be
created equal in size to the largest device to be swapped to accommodate all volumes to be swapped.
128 directors
Previous Enginuity versions supported up to 16 director boards, with four processors per board – labeled Athrough D – for a total of 64 directors, front end and back end. The Symmetrix VMAX with Enginuity
5874 still supports 16 director boards, but now with eight emulations per board – labeled A through H – for
a total of 128 front-end and back-end directors.
The 64 front-end directors can be configured as:
• Up to 128 Fibre Channel (two ports per director emulation)
• Up to 64 FICON
• Up to 64 GigE/iSCSI
• Up to 64 RE/RF
Support for 2,400 drivesThe Symmetrix VMAX with Enginuity 5874 is incrementally scalable, supporting from 40 to 2,400 4 Gb/s
high-performance Fibre Channel disk drives, providing a maximum raw capacity of approximately 1
petabyte (PB).
Metadata reduct ion
Because Enginuity 5874 supports up to 2,400 drives, with a possible 512 hypers per drive available to beconfigured, the Symmetrix VMAX can scale well beyond existing limits. In order to accommodate the
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potential growth, metadata related to the status of volume tracks was reduced for all standard volumes,
thereby reducing the amount of global memory required, improving performance, and increasing usable
disk capacity to 2 PB.
Conclusion
Enginuity 5874 features help reduce cost and deliver service levels via scale-out and tiering; providemanagement abstraction to enable ease, speed and automation; and deliver “24 x 7 x Forever” application
availability.
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