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BACKUP command (unspecified) fails?

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The Question is:

While restoring the data which have been backuped at a tape, the following
 message appears:
SYSTEM-F-NOTFILEDEV, device is not file structured
%MOUNT-I-WRITELOCK, volume is write locked
%MOUNT-I-MOUNTED, PPAS mounted on _PPAS01$MKB500:
%BACKUP-F-LABELERR, error in tape label processing on PPAS01
-SYSTEM-W-ENDOFFILE, end of file
BACKUP_USER  job terminated at  8-SEP-2003 16:36:32.22
knowing that we change the tape drive with new one, and the problem remains.
So, what we have to do in order to solve this error.

The Answer is :

  Please contact the support center, as it would appear that the DCL
  commands used -- and unspecified, unfortunately -- are inappropriate
  for the tape, or that the tape is mis-positioned, or some other error.
  The _device is not file structured_ error is particularly troubling,
  as it would imply that DCL commands that are effectively or actually
  incorrect for the particular tape MOUNT context are in use here, and
  these can definitely lead to this error.
  For details on correctly writing and reading a mult-volume tape, please
  follow the commands and examples within the BACKUP manual.
  Typically, the following:
    $ INITIALIZE mmcu: label
    $ MOUNT/FOREIGN mmcu:
    $ BACKUP/IMAGE ddcu: mmcu:saveset.bck/SAVE
  if you wish to specify and maintain a sequence of volume labels on
  the tapes, you may need to add the following BACKUP qualifiers:
  and the following MOUNT qualifier:
  The OpenVMS Wizard would also encourage installation of the current
  ECO kits, as well.

answer written or last revised on ( 24-NOV-2003 )

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