The Question is:
Please tell me what causes this during a backup to a TZ88 DLT.
The Answer is :
This can be caused by dismounting a cartridge tape with the unload
option -- only after a media swap (removal and re-insertion) can the
media be accessed. This parallels the behaviour of traditional tape
storage: once a tape is unloaded, operator intervention is required.
VOLINV, volume is not software enabled
Facility: SYSTEM, System Services
Explanation: The volume valid bit is not set for the volume. All physical
and logical I/O operations will be rejected until the bit is
User Action: Check for a programming error. Verify that the volume is
mounted and loaded. Check to see that the power is on before
retrying the program.