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Having created a cache volume, you now need to prepare the space-optimized snapshots that you require.
The following command sets up a space-optimized snapshot, mysovol, using the cache volume, mycache:
# vxassist -g mydg -P myclpool make mysovol 2g type=snapshot \
cachevolume=mycache init=active
The argument 2g is the same as the length of the original source volume for which the snapshot is being prepared. This value defines the logical size of the snapshot. The actual amount of storage that the snapshot requires is less than this, and is limited by the size of the cache volume.
See Creating a shared cache volume and preparing space-optimized snapshots.