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230 Creating and administering plexes
Taking plexes offline
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 [-g diskgroup] off plex
If a disk fails (for example, it has a head crash), you can use the vxmend
command to take offline all plexes that have associated subdisks on the affected
disk. For example, if plexes vol01-02 and 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 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.