After hardware refresh, if there are inconsistencies between the DDB and the CommServe database during a backup or auxiliary copy operation, the DDBs are put in maintenance mode and an appropriate event message is displayed in the Event Viewer window. In such cases, run DDB Resynchronization to bring the DDBs online and revert it to a reusable state from maintenance mode.
For more information, see Resynchronizing the Deduplication Database.