Raid Migration - Fujitsu Eternus DX80 S2 User Manual

Chapter 3 Setup
3.6 Optimizing Volume Configurations
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Changing the RAID level
• RAID Migration (to a RAID group with a different RAID level)
Migrating to a RAID group with a different RAID level changes the RAID level of volumes.
This is used to convert the RAID level of all the volumes belonging to a given RAID group.
• Logical Device Expansion (and changing RAID levels when adding the new drives)
The RAID level may also be changed when adding new drives to a RAID group. This is used
to convert the RAID level of all the volumes belonging to a given RAID group.
3.6.1

RAID Migration

RAID Migration is a function that transfers a volume to a different RAID group while guaranteeing
the integrity of the data. By using RAID Migration, RAID groups and volumes can be hot
switched. This allows easy redistribution of volumes among RAID groups in response to
customer needs. The redistribution of volumes and reconfiguration of RAID groups (e.g. chang-
ing the RAID level from RAID5 to RAID1+0) can be performed while the system is running.
This section describes the restrictions and notes on using RAID Migration.
For details on the RAID Migration procedure, refer to "ETERNUS Web GUI User's Guide" or
"ETERNUS CLI User's Guide".
• Volumes can be specified as a target for RAID Migration.
• The maximum number of volumes in simultaneous RAID Migration operations is 32 volumes.
• The total capacity of volumes in simultaneous RAID Migration operations is up to 128TB.
• The volume types that can be migrated are "Standard/Open", "TPV", and "FTV". RAID
groups, TPPs, and FTRPs can be selected as the RAID Migration destination.
The following nine combinations of volume types (migration source volume → migration
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destination volume) are supported:
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• When the RAID Migration destination is a "FTRP", use the "Flexible Tier Migration" function of
ETERNUS CLI.
• RAID Migration cannot be performed when the source volume type is "SDV" or "SDPV".
• Select RAID groups under any of the following conditions for the RAID Migration destination:
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ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
Standard / Open → Standard / Open
Standard / Open → TPV
Standard / Open → FTV
TPV → Standard / Open
TPV → TPV
TPV → FTV
FTV → Standard / Open
FTV → TPV
FTV → FTV
The RAID group is not registered as the REC Disk Buffer.
The RAID group has an unused area that is more than the capacity of the migration source
volume.
Copyright 2012 FUJITSU LIMITED
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