SyncRep fail-over behaviour

Setup: 1x Campus, 2x server rooms, direct full mesh fiber between iSCSI switches

In each room the customer has 2 ESXi 5.5 hosts, 2x iSCSI switches and 1xPS6500

The iSCSI network is a flat layer 2 network. The customer wants SyncRep enabled and both server rooms to be active/active to make good ROI. In a DR scenario, for example server room A goes offline. he wants VMs to failover to server room B using VMware HA.

What happens exactly with the SyncRep fail-over. I have read the TR article on this which mentions the naa changes and the restores have to be rescanned. Plus intervention in the Group Manager.

Can anyone elaborate any futher on exactly what to expect and what actions will have to be taken.

Thanks