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231Creating and administering plexes
Detaching plexes
Detaching plexes
To temporarily detach one data plex in a mirrored volume, use the following
command:
# vxplex [-g diskgroup] det plex
For example, to temporarily detach a plex named vol01-02 in the disk group,
mydg, and place it in maintenance mode, use the following command:
# vxplex -g mydg det vol01-02
This command temporarily detaches the plex, but maintains the association
between the plex and its volume. However, the plex is not used for I/O. A plex
detached with the preceding command is recovered at system reboot. The plex
state is set to STALE, so that if a
vxvol start command is run on the appropriate
volume (for example, on system reboot), the contents of the plex is recovered
and made ACTIVE.
When the plex is ready to return as an active part of its volume, follow the
procedures in the following section, “Reattaching plexes.”
Reattaching plexes
When a disk has been repaired or replaced and is again ready for use, the plexes
must be put back online (plex state set to ACTIVE). To set the plexes to ACTIVE,
use one of the following procedures depending on the state of the volume.
■ If the volume is currently ENABLED, use the following command to reattach
the plex:
# vxplex [-g diskgroup] att volume plex ...
For example, for a plex named vol01-02 on a volume named vol01 in the
disk group, mydg, use the following command:
# vxplex -g mydg att vol01 vol01-02
As when returning an OFFLINE plex to ACTIVE, this command starts to
recover the contents of the plex and, after the recovery is complete, sets the
plex utility state to ACTIVE.
■ If the volume is not in use (not ENABLED), use the following command to re-
enable the plex for use:
# vxmend [-g diskgroup] on plex
For example, to re-enable a plex named vol01-02 in the disk group, mydg,
enter:
# vxmend -g mydg on vol01-02
In this case, the state of vol01-02 is set to STALE. When the volume is next
started, the data on the plex is revived from another plex, and incorporated
into the volume with its state set to ACTIVE.