Hello, for some reason, at some point today our monitoring alerted us that the application status is 'down' on our DAG on exchange.
In the cluster failover manager, each host had written the following log entry:
"Cluster node 'SERVERNAME' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges."
I followed the article based on the issue
But was unable to locate the problem. A few errors we returned regarding a single point of failures on the NICs for the exchange servers, labelling them as a single point of failure, but otherwise, the exchange servers within the DAG seem OK.
I have also checked the DAG settings within Exchange Management Console to see if there is any issues within that and I can see all databases are healthy and synced, with one server having the Databases mounted which is normal behaviour. Despite all this I am still unable to see any actual issues which could lead to why the cluster of the DAG is showing as down.
I have taken a look within the cluster management MMC and can see that there is nothing listed within the 'Cluster Core Resources', other than the clusters IP, surely there should be an application or directory listed here ?
any help or advice would be greatly appreciated.
thanks
