Currently I have several working 2012 Guest clusters for various functions. I'm now looking at upgrading my "SQL Guest Cluster" which has 2 nodes (VMs) at Server 2012, 2 SQL 2012 instances, and is connected to shared storage through Virtual Fiber Channel.
I know I can't have mixed OS levels in a Failover Cluster, which is what is making this difficult.
What would be the best method for upgrading the 2 nodes to Server 2012 r2 (ie no-minimum downtime)?
For a file share guest cluster I was able to evict a node, remove failover role, upgrade node, create new cluster ("name_r2_cluster"), migrate File Server Role to new cluster using cluster tool...however SQL is not supported for the copy function.
Thanks in advance!