Silicon Graphics InfiniteStorage 4000 Series, Настройка и обслуживание

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188 Troubleshooting and Diagnostics
The
set volume
command lets you change settings for these items:

The cache flush modifier

The cache without batteries enabled or disabled

The mirror cache enabled or disabled

The read cache enabled or disabled

The write cache enabled or disabled

The read ahead multiplier

The redundancy check enabled or disabled
Defragmenting a
Volume Group
When you defragment a volume group, you consolidate the free capacity in the
volume group into one contiguous area. Defragmentation does not change the way in
which the data is stored on the volumes. As an example, consider a volume group
with five volumes. If you delete volume 1 and volume 3, your volume group is
configured as follows:
space, volume 2, space, volume 4, volume 5, original
unused space
When you defragment this volume group, the space (free capacity) is consolidated
into one contiguous location after the volumes. After being defragmented, the volume
group appears as follows:
volume 2, volume 4, volume 5, consolidated unused
space
To defragment a volume group, use this command:
start volumeGroup [ volumeGroupNumber ] defragment
where
volumeGroupNumber
is the identifier for the volume group.
Troubleshooting
and Diagnostics If a storage array exhibits abnormal operation or failures, you can use the commands
that are described in this section to help determine the cause of the problem.
Detailed Error
Reporting
Data collected from an error encountered by the CLI is written to a file. Detailed error
reporting under the CLI works as follows:

If the CLI must abnormally end running CLI commands and script commands,
error data is collected and saved before the CLI finishes.

The CLI saves the error data by writing the data to a standard file name.

The CLI automatically saves the data to a file. Special command line options are
not required to save the error data.