Adding a mirror to a volume
You can add a mirror to a volume with the vxassist command, as follows:
# vxassist [-b] [-g diskgroup] mirror volume
Specifying the -b option makes synchronizing the new mirror a background task.
For example, to create a mirror of the volume voltest in the disk group, mydg, use the following command:
# vxassist -b -g mydg mirror voltest
You can also mirror a volume by creating a plex and then attaching it to a volume using the following commands:
# vxmake [-g diskgroup] plex plex sd=subdisk ...
# vxplex [-g diskgroup] att volume plex