HP OpenVMS Systemsask the wizard | 
	
 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
                set.
 
  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.
 
 
 
 
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