Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

443Using Storage Expert
Identifying configuration problems using Storage Expert
■ To recover a volume, see the chapter “Recovery from Hardware Failure” in the
Veritas Volume Manager Troubleshooting Guide.
Disk striping
Striping enables you to enhance your system’s performance. Several rules enable you to
monitor important parameters such as the number of columns in a stripe plex or RAID-5
plex, and the stripe unit size of the columns.
Checking the configuration of large mirrored-stripe volumes
(vxse_mirstripe)
To check whether large mirror-striped volumes should be reconfigured as striped-mirror
volumes, run rule
vxse_mirstripe.
A large mirrored-striped volume should be reconfigured, using relayout, as a striped-
mirror volume to improve redundancy and enhance recovery time after failure.
To convert a mirrored-striped volume to a striped-mirror volume, see “Converting
between layered and non-layered volumes” on page 292.
Checking the number of columns in RAID-5 volumes (vxse_raid5)
To check whether RAID-5 volumes have too few or too many columns, run rule
vxse_raid5.
By default, this rule assumes that a RAID-5 plex should have more than 4 columns and
fewer than 8 columns.
See “Performing online relayout” on page 286 for information on changing the number of
columns.
Checking the stripe unit size of striped volumes (vxse_stripes1)
By default, rule vxse_stripes1 reports a violation if a volume’s stripe unit size is not set
to an integer multiple of 8KB.
See “Performing online relayout” on page 286 for information on changing the stripe unit
size.
Checking the number of columns in striped volumes
(vxse_stripes2)
The default values for the number of columns in a striped plex are 16 and 3. By default,
rule
vxse_stripes2 reports a violation if a striped plex in your volume has fewer than 3
columns or more than 16 columns.
See “Performing online relayout” on page 286 for information on changing the number of
columns in a striped volume.