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Before you can take a full-sized snapshot of an application volume, you must prepare the empty volume that is to become the snapshot volume as shown in the following command:
# vxassist -g mydg -P myclpool make mysnpvol 2g type=snapshot\
This command automatically associates a data change object (DCO) and DCO volume with the volume.
See Creating a volume for use as a full-sized instant or linked break-off snapshot.