Exchange: Activate Database Copy fails
After some exchange services failed on one of the nodes in our Exchange 2010 DAG we got some problems with one database. The database was mounted on server2 where it has an activation preference of 2. Trying to manually activate the database on server1, where is has an activation preference of 1, resulted in the following error: ——————————————————– Microsoft Exchange Error ——————————————————– Cannot activate database copy ‘Activate Database Copy…’. Activate Database Copy… Failed Error: An Active Manager operation failed. Error: The database action failed. Error: Operation failed with message: MapiExceptionJetErrorAttachedDatabaseMismatch: Unable to mount database. (hr=0x80004005, ec=-1216) . [Database: DB1, Server: server1] An Active Manager operation failed. Error: Operation failed with message: MapiExceptionJetErrorAttachedDatabaseMismatch: Unable to mount database. (hr=0x80004005, ec=-1216) . [Server: server1] MapiExceptionJetErrorAttachedDatabaseMismatch: Unable to mount database. (hr=0x80004005, ec=-1216) ——————————————————– OK ——————————————————– The solution is actually quite simple: Suspend the database copy on server1 and update the database copy. Then try…