Hi - This is more of a SQL Cluster design, than NetApp. If you are running SQL 2012 with Always On groups, why not just create the LUN's at each side on your NetApp Filers and use Alays On to replicate the data? If Network capacity and speed is an issue, then you could use snapmirror, but your LUN's at the replica site would be read only and unmounted, unless you break the mirrors etc.