Veritas Storage Foundation 5.1 SP1: Storage and Availability Management for Oracle (5900-1504, April 2011)

If the snapshot has not been taken and the snapshot plex (mirror) exists,
remove the snapshot as follows:
# vxsnap -g diskgroup rmmir volume
2
Remove the DCO and DCO volume:
# vxsnap -g diskgroup unprepare volume
3
Remove the snapplan.
# /opt/VRTS/bin/dbed_vmchecksnap -S PROD -f snapplan -o remove
For example, the following commands will remove a snapshot volume from
disk group PRODdg:
# vxsnap -g PRODdg dis snap_v1
# vxvol -g PRODdg stop snap_v1
# vxedit -g PRODdg -rf rm snap_v1
193Using Database FlashSnap for backup and off-host processing
FlashSnap commands