VERITAS Volume Manager 3.5 Administrator's Guide (September 2004)

Creating and Administering Plexes

Dissociating and Removing Plexes

Chapter 6 207

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 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” on page 195” 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