VERITAS Volume Manager 3.5 Administrator's Guide (September 2002)

Taking Plexes Offline
154 VERITAS Volume Manager Administrator’s Guide
For example, tocreatea mirrored,fsgen-type volume namedhome, and toassociate two
existing plexes named home-1 and home-2 with home, use the following command:
# vxmake -U fsgen vol home plex=home-1,home-2
Note You can also use the command vxassist mirror volume to add a data plex as a
mirror to an existing volume.
Taking Plexes Offline
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
vxmend and vxplex.
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 off plex
If a disk has a head crash, put allplexes that have associated subdisks on the affected disk
OFFLINE. For example, if plexes vol01-02 and vol02-02 had subdisks on a drive to be
repaired, use the following command to take these plexes offline:
# vxmend off vol01-02 vol02-02
This command places vol01-02 and 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.
Detaching Plexes
To temporarily detach one data plex in a mirrored volume, use the following command:
# vxplex det plex
For example, to temporarily detach a plex named vol01-02 and place it in maintenance
mode, use the following command:
# vxplex det vol01-02