your to fast i had this already typed up - i will post any way.
That is a very good question and we should post this on our kb.open-e.com
Ok, here is what will happen if your Primary "DIED" and you will place a new server with new hardware (just for the worst case).
Stop the replication from the Secondary/active server then from the Volume Manager / Vol. replication -> Function: Volume replication modes stop the volumes being replicated then set the iSCSI Logical Volumes to Source mode. Then set this as Primary / Active in the iSCSI Failover section of the GUI.
Then rebuild your new server setting the iSCSI Logical Volumes to be in destination mode, let the iSCSI Logical Volumes complete their replication process and make this your secondary / passive server in the iSCSI Failover section.