We have an exchange environment with two database servers in a DAG with the exchange frontend server as witness. We are able to manually fail over the active databases, and if the server with the active database is shutdown properly the databases failover to the inactive node. Suddenly powering off the active server also safely fails over to the inactive node.
Problem arises when both server are neatly shutdown and the active server does not come back up. The inactive server is unable to activate the databases. Also when the witness server is available.