Problem description: You have got odd number of nodes. To prevent possible ties in the quorum vote you added a witness disk to the cluster and adjusted the quorum mode in the cluster manager.
However, when you perform a failover from SSMS on our SQL Server 2012 Availability group, we got a validation WSFC quorum vote configuration warning with action required
Error message: The current WSFC cluster quorum vote configuration is not recommended for this availability group.
Cause: This issue occurs because of a known issue in Windows Server Failover Clustering.
Resolution: To resolve this issue, you have to apply the hotfix below on all computers node of your cluster:
A hotfix is available to let you configure a cluster node that does not have quorum votes in Windows Server 2008 and in Windows Server 2008 R2
Current status: After applied the fix, you should see that the warning is vanished.
Michel Degremont | Xbox Live Music - DBA Team - SQL Server & PDW |