Veritas Volume Manager 5.0 Troubleshooting Guide Guide (September 2006)

13Recovery from hardware failure

Recovering an unstartable mirrored volume

A system crash or an I/O error can corrupt one or more plexes of a mirrored volume and

leave no plex CLEAN or ACTIVE. You can mark one of the plexes CLEAN and instruct the

system to use that plex as the source for reviving the others as follows:

1 Place the desired plex in the CLEAN state using the following command:

# vxmend [-g diskgroup] fix clean plex

For example, to place the plex vol01-02 in the CLEAN state:

# vxmend -g mydg fix clean vol01-02

2 To recover the other plexes in a volume from the CLEAN plex, the volume must be

disabled, and the other plexes must be STALE. If necessary, make any other CLEAN

or ACTIVE plexes STALE by running the following command on each of these

plexes in turn:

# vxmend [-g diskgroup] fix stale plex

3 To enable the CLEAN plex and to recover the STALE plexes from it, use the

following command:

# vxvol [-g diskgroup] start volume

For example, to recover volume vol01:

# vxvol -g mydg start vol01

For more information about the vxmend and vxvol command, see the vxmend(1M) and

vxvol(1M) manual pages.

Note: Following severe hardware failure of several disks or other related subsystems

underlying all the mirrored plexes of a volume, it may be impossible to recover the

volume using

vxmend. In this case, remove the volume, recreate it on hardware that is

functioning correctly, and restore the contents of the volume from a backup or from a

snapshot image.