10 easy steps .. and a few nervous twitches 
(1) Make sure all cluster services are running off the same server; in my case node01 has all the luns and services etc. On Windows 2012+ you can use drain nodes.
(2) Shutdown the Cluster.
(3) Remove old iSCSI connections and shutdown the node with no services; then shutdown the primary node.
(4) Copy the Luns to the new SAN using the migration tools provided by the SAN supplier e.g. SANCopy making sure you copy the Lun id’s and serial numbers.
(5) Disconnect the old Luns via the San Manager from node01 and node02 so that the servers cannot see the old SAN Luns.
(6) Start node01 and configure the iSCSI connections and paths to the new SAN.
(7) From the new SAN allocate the migrated Luns to node01.
(8) In node01 check disk manager for the Luns; they should say reserved?
(9) Start the Cluster and check that the services have come back online?
(10) Repeat steps (6) and (7) on node02 and verify that both nodes are now showing in Failover Cluster Manager.
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