Is it possible to enable a NSS pool for clustering after it has been

I'm running NW65sp7 and about to start clustering.

I have three servers with multiple NSS volumes each all on SAN. I am adding
a fourth server and wish to put all 4 into a cluster.
I'm hoping not to have to migrate date from the existing volumes/pools to
newly created shareable ones, but can somehow enable sharing on existing
volumes/pools as needed.

Thoughts suggestions?