Use the following command to add a mirror to an existing volume:
# vxassist -g exdg mirror vol1
Use the following command to add two mirrors to a volume:
# vxassist -g exdg mirror vol1 nmirror=2
Use the following command to add a mirror to the volume vol1, where the new mirror is like the existing plex p1:
# vxassist -g exdg mirror vol1 plexname=p1
Use the following command to remove a mirror from a volume:
# vxassist -g exdg remove mirror vol1
Use the following command to remove the plex p1 from the volume v1:
# vxassist -g exdg remove mirror vol1 plexnames=p1