We have a 3 node cluster for an AAG. 1 node is the primary SQL server, 1 node is the secondary SQL server and there is a quorum node.
Last week the secondary SQL server had an issue where it was likely still pingable but not really responding to any other requests, essentially it had hung.
The cluster went down for this time along with SQL and only came back up when this server was restarted.
Upon attempting to open up Cluster Manager whilst the secondary server was in hung state – there was an error stating Unable to start cluster and something about could not connect to wmi on the server that had hung.
My questions are: Is this normal behaviour? There was quorum with the primary and quorom node still being online. So I would have thought the cluster would have remained online.
If the secondary server had gone completely offline i.e. it was powered off – the cluster would have remained up?
Thanks