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

Chapter 6, Creating and Administering Plexes

Dissociating and Removing Plexes

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Dissociating and Removing Plexes

When a plex is no longer needed, you can dissociate it from its volume and remove it as

an object from VxVM. You might want to remove a plex for the following reasons:

◆ to provide free disk space

◆ to reduce the number of mirrors in a volumeso youcan increase thelength of another

mirror and its associated volume. When the plexes and subdisks are removed, the

resulting space can be added to other volumes

◆ to remove a temporary mirror that was created to back up a volume and is no longer

needed

◆ to change the layout of a plex

Caution To save the data on a plex to be removed, the conﬁguration of that plex must be

known. Parameters from that conﬁguration (stripe unit size and subdisk

ordering) are critical to the creation of a new plex to contain the same data.

Before a plex is removed, you must record its conﬁguration. See “Displaying

Plex Information” on page 148” for more information.

To dissociate a plex from the associated volume and remove it as an object from VxVM,

use the following command:

# vxplex -o rm dis plex

For example, to dissociate and remove a plex named vol01-02, use the following

command:

# vxplex -o rm dis vol01-02

This command removes the plex vol01-02 and all associated subdisks.

Alternatively, you can ﬁrst dissociate the plex and subdisks, and then remove them with

the following commands:

# vxplex dis plex

# vxedit -r rm plex

When used together, these commands produce the same result as the vxplex -o rm

dis command. The -r option to vxedit rm recursively removes all objects from the

speciﬁed object downward.In thisway, a plex and its associated subdisks can be removed

by a single vxedit command.