HP Veritas Volume Manager 5.0 -UX 11i v3 manual Detaching plexes, Reattaching plexes

Creating and administering plexes

Detaching plexes

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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 vol01-02in 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 vol01-02on 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 vol01-02in the disk group, mydg, enter:

# vxmend -g mydg on vol01-02

In this case, the state of vol01-02is 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.