© 2009 IBM Corporation

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

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Ryan LeonardStorage and Solutions Architect

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Storage Partitions Creates multiple virtual storage systems

Heterogeneous host support

Storage-based implementation helps provide data integrity

Logical partitioning helps provide flexibility

Host Server

DS3000 / DS4000 / DS5000

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Partitioning can be implemented at the host and/or host group level

Number of partitions required dependant on the desired configuration

Partitions licensed in increments – 2, 4, 8, 16, 32, 64, 128, 256, 512

Storage Partitions

Host Server

Scenario 13 stand-alone

servers

Scenario 23 servers, 1 cluster (i.e. ESX, Windows Cluster,

etc.)

Scenario 33 servers, mixed

case

3 partitions

1 partition 4 partitions

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

FlashCopy A point-in-time (PiT) image of a logical drive / LUN

– Logical equivalent of a physical copy

Features– Near instantaneous copy– Requires less disk space than a full copy– Can be mapped to any host – Can be read from, or written to

Primary uses– PiT backup image– File / volume restoration– Data mining / analysis

Base Volume

Snapshot Reserve

FlashCopy Volume

A’ B C A B C

C’

A C

Physical Logical

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

FlashCopy Advantages

– Created nearly instantaneously– Space efficient

• Default is 20% size of the original

Disadvantages– Pointers to original data set

• Rely on original data being available

– Can impact performance

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Volume Copy

Complete (byte-by-byte) PiT replication of one logical drive (source) to another (target) within a storage system– Target logical drive also referred to

as a clone

Primary uses– Full PiT data set available for

analysis, mining, testing, backup• Helps eliminate I/O

contention on the primary logical drive

Production Server Analysis Server

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

VolumeCopy Advantages

– Data resides on (potentially) separate set of spindles• Physically distinct clone

Disadvantages– Requires similar disk space to original

• 1TB logical drive volumecopy requires another 1TB to copy to

– Not created instantaneously• The larger the logical drive, the longer it takes to build clone

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Enhanced Remote Mirroring

Storage-based data replication– Ongoing, real-time replication of a

logical drive from one DS4000 storage subsystem to another

Three mirroring modes– Metro Mirror – Global Copy – Global Mirror

Primary uses– Disaster recovery– Centralize backup data– Centralize data mining / analysis

A1

B1mirror

A1mirror

B1

Crossmirroring

SAN / WAN

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Metro Mirror

Synchronous mirroring between DS4000 storage subsystems

Limit of 10 km

Constant synchronization between primary logical drive and secondary logical drive

Writes to both the local primary logical drive and the remote secondary logical drive must complete before I/O completion status is returned to initiating host server

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Global Copy The primary storage subsystem no longer waits for the

secondary I/O to complete

Latency issues are eliminated Unlimited distances Up to 128 outstanding I/Os per logical drive Increased performance Benefit: Flexibility in designing remote mirroring solutions

Statements of IBM future plans and directions are provided for information purposes only. Plans and direction are subject to change without notice.

System Storage July 2009

Ensures that all I/Os to the secondary system are in the same order as it was processed at the primary

Eliminates out-of-order arrivals at the remote site Logical drives defined in a consistency group participate in write

order consistency Optional mode Benefit: Provides proper database logical consistency for

successful recovery

Global Mirror (Write Consistency)