Microsoft Recommended Hotfixes For DAGs Running Windows 2008 R2…

The Exchange Team blog has published an article recommending all DAG members running Windows 2008 R2 to have a few hotfixes installed. Microsoft has encountered scenarios in which a transient network failure occurs (a failure of network communications for about 60 seconds) and as a result, the entire cluster is deadlocked and all databases are within the DAG are dismounted. Since it is not very easy to determine which cluster node is actually deadlocked, if a failover cluster deadlocks as a result of the reconnect logic race, the only available course of action is to restart all members within the entire cluster to resolve the deadlock condition.

The following KBs list the recommended hotfixes .

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