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233Creating and administering plexes
Copying volumes to plexes
Copying volumes to plexes
This task copies the contents of a volume onto a specified plex. The volume to be
copied must not be enabled. The plex cannot be associated with any other
volume. To copy a plex, use the following command:
# vxplex [-g diskgroup] cp volume new_plex
After the copy task is complete, new_plex is not associated with the specified
volume volume. The plex contains a complete copy of the volume data. The plex
that is being copied should be the same size or larger than the volume. If the
plex being copied is larger than the volume, an incomplete copy of the data
results. For the same reason, new_plex should not be sparse.
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 224” for more information.
To dissociate a plex from the associated volume and remove it as an object from
VxVM, use the following command:
# vxplex [-g diskgroup] -o rm dis plex
For example, to dissociate and remove a plex named vol01-02 in the disk
group, mydg, use the following command:
# vxplex -g mydg -o rm dis vol01-02
This command removes the plex vol01-02 and all associated subdisks.