Transcript Primary uses

Premium Features
Ryan Leonard
Storage 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.
© 2009 IBM Corporation
System Storage
July 2009
Storage Partitions
 Creates multiple virtual storage systems
 Heterogeneous host support
Host Server
DS3000 / DS4000 /
DS5000
 Storage-based implementation helps provide data integrity
 Logical partitioning helps provide flexibility
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
 Partitioning can be implemented at the host and/or host group level
 Number of partitions required dependant on the desired configuration
Host Server
 Partitions licensed in increments – 2, 4, 8, 16, 32, 64, 128, 256, 512
3
partitions
1 partition
4
partitions
Scenario 1
Scenario 2
Scenario 3
3 stand-alone
servers
3 servers, 1 cluster (i.e.
ESX, Windows Cluster,
etc.)
3 servers, mixed
case
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
C’
A’ B C
ABC
Base Volume
FlashCopy
Volume
AC
Snapshot
Reserve
Physical
Statements of IBM future plans and directions are provided for information
purposes only. Plans and direction are subject to change without notice.
Logical
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
Production Server Analysis Server
 Primary uses
– Full PiT data set available for
analysis, mining, testing, backup
• Helps eliminate I/O
contention on
the primary logical drive
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
SAN / WAN
A1
A1
mirror
Cross
mirroring
B1
mirror
Statements of IBM future plans and directions are provided for information
purposes only. Plans and direction are subject to change without notice.
B1
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
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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
Global Mirror (Write Consistency)
 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
Statements of IBM future plans and directions are provided for information
purposes only. Plans and direction are subject to change without notice.