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Tape Compression/Compaction Problems?

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The Question is:

I'm using a Digital TZ885 autoloader tape device in a Alpha 4100/VMS 7.2-1
 environment. As documented in the tape user guide the tape should store on
 high density 40GB/tape (I'm using DLTape IV cartridge tapes...). It did not
 (it work only up to 20 GB/tap
e !!!???).
Attached are the dev inf:
Magtape BBMTR2$MKB500:, device type TZ88, is
online, record-oriented device,
file-oriented device, error logging is enabled,
loader present, controller supports compaction
(compaction  disabled), device supports fastskip.
    Error count                    9
    Operations completed           16097597
    Owner process                 ""    Owner
    UIC                      [SYSTEM]
    Owner process ID        00000000    Dev
    Prot       S:RWPL,O:RWPL,G:R,W:RWPL
    Reference count                0    Default
    buffer size               64512
    Density                     TK88
    Format                        Normal-11
  Volume status:  no-unload on dismount,
  beginning-of-tape, odd parity.

The Answer is :

  Please ensure that current OpenVMS ECO kits are installed, that
  /MEDIA_FORMAT=COMPACTION is used throughout MOUNT, BACKUP, etc,
  and that the data involved is actually compressable.
  If the problem persists, please contact the Compaq Customer
  Support Center for assistance.

answer written or last revised on ( 23-MAY-2000 )

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