Once a volume has been created and placed online (
ENABLED), VxVM can temporarily disconnect plexes from the volume. This is useful, for example, when the hardware on which the plex resides needs repair or when a volume has been left unstartable and a source plex for the volume revive must be chosen manually.
Resolving a disk or system failure includes taking a volume offline and attaching and detaching its plexes. The two commands used to accomplish disk failure resolution are
To take a plex
OFFLINE so that repair or maintenance can be performed on the physical disk containing subdisks of that plex, use the following command:
vxmend [-g diskgroup
] off plex
If a disk has a head crash, put all plexes that have associated subdisks on the affected disk
OFFLINE. For example, if plexes
vol02-02 in the disk group,
mydg, had subdisks on a drive to be repaired, use the following command to take these plexes offline:
vxmend -g mydg off vol01-02 vol02-02
This command places
vol02-02 in the
OFFLINE state, and they remain in that state until it is changed. The plexes are not automatically recovered on rebooting the system.