I would suggest to talk to EMC professional service - I think they have a procedure to do so
 We are retiring an old array and moving our DR NS80G to our new 960.  Do we need to re-replicate our 100TB of DR data across the WAN from the source celerras or could we use a cascaded replication (or some other method) to locally move the DR replicas over to pools on the new Clariion, replications intact?
Replicating NS80G DR data to new Clariion