Whenever a user logs on to the system, tape unit 0 is automatically selected by default. If you have only one tape drive on your system, it will be set up as the default tape drive (LTU 0).
The current tape assignments are determined by examining the report produced by the T-WHAT and T-STATUS commands. If you have more than one tape drive on your system, T-WHAT indicates the one most recently selected.
T-STATUS lists all assigned logical tape units, the tape devices to which they are assigned, the processes (if any) to which they are attached, and the tape format specifications.
Any tape units that have not been assigned with the SET-TAPE command are not listed in the T-STATUS report.
See Also