FUJITSU Disk Storage System DX60 - Manual (Page 46)

Chapter 3 Setup
3.3 Optimizing Volume Configurations
ETERNUS DX60 S2 Disk storage system User’s Guide -Operation-
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Copyright 2012 FUJITSU LIMITED P3AM-5512-03ENZ0
3.3 Optimizing Volume Configurations
The ETERNUS DX Disk storage system allows for the expansion of volumes and RAID group
capacities, migration among RAID groups, and the changing of RAID levels when the volumes
are defined.
Exact details depend on the desired operation. Select from the following procedures.
This section describes the restrictions on using each function of the ETERNUS DX Disk storage
system and the notes on setting up each function of the ETERNUS DX Disk storage system.
For details on the above procedures, refer to "ETERNUS Web GUI User's Guide" or "ETERNUS
CLI User's Guide".
■ Expansion of volume capacity
• RAID Migration (with increased migration destination capacity)
When volume capacity is insufficient, a volume can be moved to a RAID group that has
enough free space. This function is recommended for use when the desired free space is
available in the destination.
• LUN Concatenation
Adds areas of free space to an existing volume to expand its capacity. This uses existing free
space to efficiently expand the volume.
■ Expansion of RAID group capacity
• Logical Device Expansion
Adds new disks to an existing RAID group to expand the RAID group capacity. This is used to
expand the existing RAID group capacity instead of adding a new RAID group to add the
volumes.
■ Migration of RAID groups
• RAID Migration
If the performance of the current RAID groups is not satisfactory due to conflicting volumes,
RAID Migration may be used to improve the performance by redistributing the RAID group
configuration.
■ 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 change the RAID level for a specific volume.
• Logical Device Expansion (and changing RAID levels when adding the new disks)
The RAID level may also be changed when adding new disks to a RAID group. This is used to
convert the RAID level of all the volumes belonging to a given RAID group.