Backup or archive of drives with duplicate volume labels is not allowed.
You tried to back up or archive a drive that has a duplicate volume label. Because TSM uses the volume label to keep track of backup or archive information, it cannot back up or archive files from a drive with a duplicate volume label.
TSM cannot select the drive for backup or archive operations.
If the volume needs to be available to the system, exit TSM and assign a unique volume label to the drive. Restart TSM and try the operation again.