Data Management - Fujitsu Eternus DX80 S2 User Manual

Chapter 3 Setup

3.4 Data Management

• Up to four disks can be activated at once in a single DE. When attempting to activate more
than four disks at once, the first four of the disks are activated, and then the rest of the disks
are activated. When this happens, the server will see increased response times and access
paths may be lost, in which case the RAID configuration or disk installation status may need
to be reviewed.
3.4 Data Management
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".
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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.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
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Copyright 2011 FUJITSU LIMITED P3AM-4842-01ENZ0