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thanks for the Welcome and replies. In the end, due to time contraints we had migrate the verification server vm to a vmfs datastore to get it working. The exchange was on a physical cluster with FC luns, verification server was a vm on nfs datastore.
I was able whilst the VM was on NFS to create luns via snapdrive. I guess in anything prior to 6.3 this wouldn't have been possible. Maybe the system drive of the verification server needs to be on an RDM. I'll keep testing anyway.