The attempted operation cannot be completed on the specified library because there are no available drives. A drive may be unavailable because an application other than the server may have the driver opened. This message may also be issued if a CHECKIN or LABEL command is issued and no drive is available to service the operation. This can be because all the drives are mounted by other processes or sessions, or the device type was incorrectly specified.
The attempted operation is terminated.
Use the QUERY DRIVE command to check the online status of the drives. Drives that are marked "Unavailable since hh:mm yy/mm/dd" are drives taken offline by the server at the time specified because of hardware failures or the inability to open the drive. If the attempted operation is a CHECKIN or LABEL command, use the QUERY MOUNT command to determine if all the drives in the library are mounted and wait until one of these is available. If there are mounted volumes with an IDLE status, use the DISMOUNT VOLUME command to free its drive, and retry the original operation.