Hello,

I have a customer where all databases dismounted, on two mailbox servers.  They were both member of a DAG.  We ended up removing disks from the cluster in cluster admin.  Then bringing disks online in Disk Manager in the OS (Server 2012). 

We were then able to bring the DBs back online using mount-database -identity **** -force

All six databases are back online now, and they are syncing between the two servers in the DAG.  However if you look in cluster admin, there are no resources or disks. 

Never seen this happen before.  Any tips on how to recover this?  Plus, how is the DAG even working without Windows Clustering? 

Many Thanks

Stuart

My god, Exchange 2010 doesnt even need to use Windows Clustering right?

You shouldn't have a any physical disk resources inside the cluster (atleast disks that host databases or logs).  The DAG does though use the Windows Failover cluster features though from my understanding all that stuff happens from within Exchange.

If the disks are physical disk resources inside the cluster, then I would expect that happen.  With a typical Windows Cluster (one not using CSV's) Windows expects the volumes to be shared and only 1 node will have access to them at a time, so it will take the disks off line on the other server.