Open Replicator will overwrite the data when you perform the activate.
We did a testing where a prod server on V2 was Open repliacted (hot pull) to a V3. This was not a migration. Just data was copied over to a test environment. I have to do the same task. The testing host currently has access to the luns and being tested on.   Question: Once the Control host has luns unmounted, will I need to do a reclaim on the luns to make them empty? OR can i just do the establish on the ORS command and it will overwrite the existing data?   Since the 2ABC lun was previously mounted, do i need to do a start/free allocation before I so Open Replicator session?
Does creating openreplicator session second time on the same set of LUNs requre 
Control Luns to be empty?