Optimizing Volume Configurations - Fujitsu Eternus DX80 S2 User Manual

Chapter 3 Setup

3.6 Optimizing Volume Configurations

• Eco-mode schedules are executed according to the date and time that are set in the ETERUS
DX Disk storage system. To turn on and turn off the disk motors according to the schedule
that is set, use the Network Time Protocol (NTP) server in the date and time setting in
ETERNUS Web GUI or ETERNUS CLI to set automatic adjustment of the date and time.
• Up to eight 2.5" drives or four 3.5" drives can be activated at the same time in a single drive
enclosure. When these maximums are exceeded, the first eight 2.5" drives or four 3.5" drives
are activated, followed by the rest of the drives in matching increments for each size. If the
number of drives that are activated in a single drive enclosure is increased, the time for drive
activation takes longer, causing the response times for the server to increase, which may
result in access paths being lost. To prevent this from occurring, the RAID configuration and
drive installation must be taken into consideration.
3.6 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".
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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.
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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.
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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.
ETERNUS DX80 S2/DX90 S2 Disk storage system User's Guide -Operation-
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Copyright 2012 FUJITSU LIMITED P3AM-4842-03ENZ0