Defragmenting An Subsystem; Troubleshooting And Diagnostics; Collecting All Support Data - IBM System Storage DS3000 Programming Manual

The set storageSubsystem command lets you change settings for these items:
v The cache block size
v The cache flush start percentage
v The cache flush stop percentage
The set logicalDrive command lets you change settings for these items:
v The cache flush modifier
v The cache without batteries enabled or disabled
v The mirror cache enabled or disabled
v The read cache enabled or disabled
v The write cache enabled or disabled
v The read ahead multiplier
v The redundancy check enabled or disabled

Defragmenting an subsystem

When you defragment an subsystem, you consolidate the free capacity in the subsystem into one
contiguous area. Defragmentation does not change the way in which the data is stored on the logical
drives. As an example, consider an subsystem with five logical drives. If you delete logical drive 1 and
logical drive 3, your subsystem is configured as follows:
space, logical drive 2, space, logical drive 4, logical drive 5, original unused space
When you defragment this subsystem, the space (free capacity) is consolidated into one contiguous
location after the logical drives. After being defragmented, the subsystem appears as follows:
logical drive 2, logical drive 4, logical drive 5, consolidated unused space
To defragment an subsystem, use this command:
start subsystem [subsystemNumber] defragment
where subsystemNumber is the identifier for the subsystem.
Note: If you need to defragment the data stored in the logical drive, you must use the appropriate
defragmenting tool for the installed operating system.

Troubleshooting and Diagnostics

If a storage subsystem exhibits abnormal operation or failures, you can use the commands that are
described in this section to help determine the cause of the problem.

Collecting All Support Data

To gather the most comprehensive information about a storage subsystem, run the save storageSu
bsystem supportData command. This command collects data for remote troubleshooting and analysis of
problems with the storage management software. All of the files gathered are compressed into a single
archive in a zipped file format. The following table lists the type of support data that is collected.
11-7
Chapter 11. Maintaining a storage subsystem