Introduction to SAN NAS

8/12/2019 Introduction to SAN NAS

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SEMINAR ON SAN AND NAS

BySHILPA K.S1BT99CS0448TH SEMESTERCOMPUTER SCIENCE


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STORAGEA functional unit into which data can beplaced, in which they can be retained and

from which they can be retrieved. The actionof placing data into a storage device.OR

The process of storing information in acomputer memory or on a magnetic tape ordisk.


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STORAGE NECESSITIES High Availability of data Data Protection Easy Management Excellent Security

Data Reliability


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Types of Storage Technologies

Local Storage(LS)

DirectAttachedStorage

(DAS)

NetworkAttachedStorage

(NAS)

StorageArea

Network

(SAN)


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Network Attached Storage (NAS)


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Definition Of NAS

Network-attached storage (NAS) is a conceptof shared storage on a network. Itcommunicates using Network File System(NFS) for UNIX environments, CommonInternet File System (CIFS) for MicrosoftWindows environments, FTP, http, and othernetworking protocols. NAS brings platformindependence and increased performance to anetwork, as if it were an attached appliance.


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Basic NAS Implementation

LAN

Client

Client

Client

Server

Server

NAS Filer

Note:NAS will work in both Workgroup & TCP/IP


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LAN(Workgroup Network)

NAS in a Work-group Environment

Client

Client

Client NAS Filer

( With NetBEUI Protocol )


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NAS in a Server Authentication Environment

LANTCP/IP

Client

Client

Client

AuthenticationServer

ApplicationServer

NAS Filer

Request


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NAS in a Metropolitan Area Solution

LAN LAN

Client Client

Client Server NAS FilerServer

ClientClient

WAN


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NAS Solutions for Todays IT Business Issues

Decreased IT Staff Cost Scale fast without Downtime Relief for your Server Multi OS Connectivity & Data Sharing Leveraging Existing Infrastructure

Transparent Backup


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Example Of NAS

LAN

Client

Client

Client

Server

SUN Storage N8200 Filer

QuantumSnap Server


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Storage Area Network(SAN)


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Definition Of SAN

The Storage Area Network (SAN) provides aflexible, networked storage infrastructure thatdecouples storage devices from their respective

servers. To accomplish this, the SANincorporates switch fabric technology,

commonly referred to as a SAN fabric, toconnect any server to any storage subsystem.


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Storage

DiskArray

StorageDiskArray

StorageDiskArray

Tape Backup

Basic SAN Implementation

Heterogeneous

Servers

FCIP

FCP FC-SW2To WAN for

Remote

Storage


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Storage Disk Array

Fault Tolerant Non-Blocking Switched Backplane

ChannelAdapter

ChannelAdapter

ChannelAdapter

ChannelAdapter

ChannelAdapter

ChannelAdapter

ChannelAdapter

Storage Array Controller

MP CPU Cache Memory

Storage Array Controller

MP CPU Cache Memory

DiskAdapter

DiskAdapter

FC-AL

FC-AL


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Storage Array ControllerBlock Diagram

Intel Xeon

Processor

Intel Xeon

Processor

Intel

E7500 MCH

Intel 82801 CAICH3Intel 82562ET

2 Channels:

200MHz ECC DDR

2 Registered DIMMs perChannel

16GB Maximum Memory

32-bit

33MHzPCI

SM Bus2.0

GPIO

LPC

10100 Mbps LANManagement port

6*USB2.0

FMH ATA 100Local IDE

Intel 82870P2 Intel 82870P2

Intel 82870P2

Switch FabricInterface

16-bit HL 2.0

PCI-X

To Switched Backplane tochannel adapters

2*64 bit 133 MHz PCI-XChannels to disk adapter

2*64 bit 133 MHz PCI-XChannels to disk adapter


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Disk Adapter Block Diagram

DDR SDRAM(up to 1GB)

IntelIOP80321

I/O Processor

PCI-XBridge

(3 rd Party Chip)

PCI-XBridge

(3 rd Party Chip)Secondary64-bit 133 MHz

Dual2F FC AL

Or

Dual U320 SCSI

PrimaryPCI-X Busto storagearraycontroller

FLASH


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Functional Description

SAN Theory of Operation-No data is written to the disk until the data has been

received twice from across the fabric. Similarly datarequests are only passed up to the fabric after twoidentical reads are received from the RAIDsubsystem.

- When the SCSI storage command goes out on theSAN fabric from the server, it is mapped as aLUN,which is then translated to a particular trackand sector by the storage array controller.

-Uses Rule-of-thumb calculations , indicating buffersize for disk caching should be between 0.5 to 1percent of the disk capacity supported by thecontroller.


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Software Stacks For Storage Protocols

SCSI FCP iSCSI FCIP

Host SCSI Driver SCSI Driver SCSI Driver SCSI Driver

FCPFC-2

FC-1HBA

Transport

iSCSITCP

IP

FCPFCIP

TCP

IP

SCSI CablesFC Fibers, Hubs

SwitchesOver any

IP networkOver any

IP network

Parallel SCSI


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The predominant system Bottleneck in aSAN is the internal system interconnects.

Need to implement high-performance I/Oprocessors to keep up with the significant

jump in the SAN fabric and disk

interface speeds.

Performance Considerations


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Design Advantage

High Performance Scalability Time-to-Market Technology Treadmill Support

SAN E l Slid


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SAN Example Slide

UNIX WIN SUN

Tape BackupBrocade

DiskArray

CompaqDiskArray

INTELDiskArray

To WAN for RemoteStorage

FC-SW2

FCIP

FCP

Heterogeneous

Servers


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Comparison Between SAN NAS


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NAS & SAN in Typical LAN Environment

LAN

SNAPServer

NT Server UNIX Server Netware ServerUNIX Clients

WindowsClients

NT Servers

Switch Switch

Bridge Bridge

DLTLibrary

DLTLibrary

Shared

Storage

NAS

SAN

StorageConnectsdirectly to

the network

Storageconnects toswitches and

servers


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Comparison Between SAN & NAS By Protocols

Fibre Channel Fibre Channel-to-

SCSI

TCP/IP

SAN NAS


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Comparison Between SAN & NAS By Applications

Mission-criticaltransaction-baseddatabase applicationprocessing

Centralized databackup

Disaster recoveryoperations Storage consolidation

File sharing in NFSand CIFS

Small-block datatransfer over longdistances

Limited read-onlydatabase access

SAN NAS


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Comparison Between SAN & NAS By Advantages

High availability Data transfer reliability Reduced traffic on the

primary network Configuration flexibility High performance High scalability Centralized management Multiple vender

offerings

Few distance limitations Simplified addition of

files sharing capacity Easy deployment and

maintenance

SAN NAS


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CONCLUSION

SANs and NAS are increasingly replacing orsupplementing traditional server-attachedstorage implementations in many data

centers. As a result, organizations arerealizing a wide range of benefits, includingincreased flexibility, easier storagedeployment,and reduced overall storagecosts. Although both SAN and NAStechnologies can provide a competitiveadvantage, each is designed for specific typesof environments and applications.


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Thank you!

Introduction to SAN NAS

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