To recover a version 20 DCO volume
Use the vxsnap command to dissociate each full-sized instant snapshot volume that is associated with the volume:
# vxsnap [-g diskgroup] dis snapvol
For the example output, the command would take this form:
# vxsnap -g mydg dis SNAP-vol1
Unprepare the volume using the following command:
# vxsnap [-g diskgroup] unprepare volume
For the example output, the command would take this form:
# vxsnap -g mydg unprepare vol1
Start the volume using the vxvol command:
# vxvol [-g diskgroup] start volume
For the example output, the command would take this form:
# vxvol -g mydg start vol1
Prepare the volume again using the following command:
# vxsnap [-g diskgroup] prepare volume [ndcomirs=number] \ [regionsize=size] [drl=yes|no|sequential] \ [storage_attribute ...]
For the example output, the command might take this form:
# vxsnap -g mydg prepare vol1 ndcomirs=2 drl=yes
This adds a DCO volume with 2 plexes, and also enables DRL and FastResync (if licensed).
For full details of how to use the vxsnap prepare command, see the Veritas Volume Manager Administrator's Guide and the vxsnap(1M) manual page.