VERITAS Volume Manager 3.1 Administrator's Guide

Volume Tasks

Dissociating and Removing Plexes

Chapter 6266

Dissociating and Removing Plexes

When a plex is no longer needed, you can remove it. Remove a plex for

the following reasons:

• to provide free disk space

• to reduce the number of mirrors in a volume so you can increase the

length 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” for more information.

To dissociate and remove a plex from the associated volume, use the

following command:

# vxplex -o rm dis

plex_name

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.

You can ﬁrst dissociate the plex and subdisks, and then remove them

with the following commands: # vxplex dis plex_name# vxedit

-r rm plex_name

When used together, these commands produce the same result as the

vxplex -o rm dis command.