So to make sure that I understand your are doing this with 2 DSS V6 and not with your DSS V5 to DSS V6 - correct?

If you are doing it with 2 DSS v6 make sure your SCSI ID and LUN# and Target names are the same. Make sure you have the Aux for the Volume Replication NICs and for the Pri. and Sec. Nodes.

Video might helps as well.

http://www.open-e.com/library/webcasts-and-videos/
2010.06 Open-E DSS V6 Synchronous Volume Replication with Failover over LAN