Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

■ Disk sparing and relocation management
■ Hardware failures
■ Rootability
■ System name
See “Rule definitions and attributes” on page 515.
Recovery time
Several “best practice” rules enable you to check that your storage configuration
has the resilience to withstand a disk failure or a system failure.
Checking for multiple RAID-5 logs on a physical disk
(vxse_disklog)
To check whether more than one RAID-5 log exists on the same physical disk, run
rule vxse_disklog.
RAID-5 log mirrors for the same physical volume should be located on separate
physical disks to ensure redundancy. More than one RAID-5 log on a disk also
makes the recovery process longer and more complicated.
Checking for large mirror volumes without a dirty region log
(vxse_drl1)
To check whether large mirror volumes (larger than 1GB) have an associated dirty
region log (DRL), run rule vxse_drl1.
Creating a DRL speeds recovery of mirrored volumes after a system crash. A DRL
tracks those regions that have changed and uses the tracking information to
recover only those portions of the volume that need to be recovered. Without a
DRL, recovery is accomplished by copying the full contents of the volume between
its mirrors. This process is lengthy and I/O intensive.
See “Preparing a volume for DRL and instant snapshots” on page 318.
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.
See “Preparing a volume for DRL and instant snapshots” on page 318.
Using Storage Expert
Identifying configuration problems using Storage Expert
510