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

440 Using Storage Expert
Identifying configuration problems using Storage Expert
For information on adding a DRL log to a mirrored volume, see “Preparing a volume for
DRL and instant snapshots” on page 267.
Checking for large mirrored volumes without a mirrored dirty
region log (vxse_drl2)
To check whether a large mirrored volume has a mirrored DRL log, run rule vxse_drl2.
Mirroring the DRL log provides added protection in the event of a disk failure.
For information on adding a mirror to a DRL log, see “Preparing a volume for DRL and
instant snapshots” on page 267.
Checking for RAID-5 volumes without a RAID-5 log
(vxse_raid5log1)
To check whether a RAID-5 volume has an associated RAID-5 log, run rule
vxse_raid5log1.
In the event of both a system failure and a failure of a disk in a RAID-5 volume, data that
is not involved in an active write could be lost or corrupted if there is no RAID-5 log.
For information about adding a RAID-5 log to a RAID-5 volume, see “Adding a RAID-5
log” on page 275.
Checking minimum and maximum RAID-5 log sizes
(vxse_raid5log2)
To check that the size of RAID-5 logs falls within the minimum and maximum
recommended sizes, run rule
vxse_raid5log2.
The recommended minimum and maximum sizes are 64MB and 1GB respectively. If
vxse_raid5log2 reports that the size of the log is outside these boundaries, adjust the
size by replacing the log.
Checking for non-mirrored RAID-5 logs (vxse_raid5log3)
To check that the RAID-5 log of a large volume is mirrored, run the vxse_raid5log3
rule.
A mirror of the RAID-5 log protects against loss of data due to the failure of a single disk.
You are strongly advised to mirror the log if
vxse_raid5log3 reports that the log of a
large RAID-5 volume does not have a mirror.
For information on adding a RAID-5 log mirror, see “Adding a RAID-5 log” on page 275.