If I am running a Windows Server 2012 Failover Cluster with SQL Server Always on Availability groups how am I supposed to apply Windows Updates to the cluster nodes?
CAU is explicity not supported and the only guidance that I can find from MS which comes close is to do a cross-cluster failover which is pretty complicated and involves 2x the hardware:
https://msdn.microsoft.com/en-us/library/jj873730.aspx