Fujitsu ETERNUS DX80 S2 Overview page 61

Chapter 5 Basic Functions
5.3 Optimization of Volume Configurations
■ Expansion of logical 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 drives 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 among 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
convert a given volume to a different RAID level.
• 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.
■ Striping for multiple RAID groups
• Wide Striping
Distributing a single volume to multiple RAID groups makes I/O access from the server more efficient and
improves the performance.
For details on the above procedures, refer to "ETERNUS Web GUI User's Guide" and "ETERNUS CLI User's Guide".
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ETERNUS DX80 S2/DX90 S2 Disk storage system Overview
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