Recovering using mirrored copies of the database
If a database volume fails because of media failure and you have enabled mirroring, then you can recover the database by using mirrored copies of the database.
After fixing the failing device, you can allocate space for the new mirrored copy and define the volume to Tivoli® Storage Manager. After you define the volume to Tivoli Storage Manager, the server synchronizes the volume with the database.