Veritas Volume Manager 5.0 Administrator's Guide (September 2006)

223Creating 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 revive 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.
If the
vxinfo command shows that the volume is unstartable (see “Listing
Unstartable Volumes” in the section “Recovery from Hardware Failure” in the
Veritas Volume Manager Troubleshooting Guide), set one of the plexes to CLEAN
using the following command: