VERITAS Volume Manager 3.5 Troubleshooting Guide (August 2002)

Chapter 1, Recovery from Hardware Failure
Understanding the Plex State Cycle
3
Additional Plex State Transitions
After a system crash and reboot, all plexes of a volume are ACTIVE but marked with plex
kernel state DISABLED until their data is recovered by the vxvol resync task.
A plex may be taken offline with the vxmend off command, made available again using
vxmend on, and its data resynchronized with the other plexes when it is reattached using
vxplex att. A failed resynchronization or uncorrectable I/O failure places the plex in
the IOFAIL state.
The following section, “Listing Unstartable Volumes,” describes the actions that you can
take if a system crash or I/O error leaves no plexes of a mirrored volume in a CLEAN or
ACTIVE state.
For information on the recovery of RAID-5 volumes, see “Failures on RAID-5 Volumes”
on page 6 and subsequent sections.
Recover data
(vxvol resync)
Initialize plex
(vxvol init clean)
Take plex offline
(vxmend off)
Shut down
(vxvol stop)
After crash
and reboot
(vxvol start)
Uncorrectable
I/O failure
Put plex online
(vxmend on)
Resync data
(vxplex att)
Resync
fails
Create plex
PS: EMPTY
PKS: DISABLED
PS: ACTIVE
PKS: DISABLED
Start up
(vxvol start)
PS: CLEAN
PKS: DISABLED
PS: ACTIVE
PKS: ENABLED
PS: OFFLINE
PKS: DISABLED
PS: IOFAIL
PKS: DETACHED
PS: STALE
PKS: DETACHED
PS = Plex State
PKS = Plex Kernel State