Optimizing Volume Configurations - Fujitsu ETERNUS DX80 S2 User Manual

Chapter 3 Setup

3.7 Optimizing Volume Configurations

3.7 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 area 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 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
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.
■ 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.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
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