DDS3 Tape drive not compressing?

From: Adam Skeggs (fun_at_optusnet.com.au)
Date: 10/24/05

  • Next message: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?" 
    Date: Mon, 24 Oct 2005 09:37:02 +1000

    Hi,

    I have a HPUX 11.11 box with a C1537A tape drive which is I believe
    DDSIII. Trouble is I can't see that hardware compresssion is working.

    Using omniback the media look like DDSIII as the capacity is about 12Gb:
    $omnimm -media_info 581490 -detail
    ...
             Total blocks : 11743616
    (or is this the compressed capacity being reported? No that doesn't make
    much sense)

    Trouble is when I write 12Gb (added up totals from bdf) it's too much -
    thus there is no compression going on it seems.

    I am using the compression device: /dev/rmt/c1t0d0BEST which should be
    the right one.

    So I am a bit stumped.

    Any clues?
    Thanks,
    Adam.

  • Next message: Jan Gerrit Kootstra: "Re: DDS3 Tape drive not compressing?"

    Relevant Pages

    • Re: DDS3 Tape drive not compressing?
      ... Adam Skeggs wrote: ... Trouble is I can't see that hardware compresssion is working. ... > Using omniback the media look like DDSIII as the capacity is about 12Gb: ... Omniback with the same device file. ...
      (comp.sys.hp.hpux)
    • Re: DDS3 Tape drive not compressing?
      ... Adam Skeggs wrote: ... Trouble is I can't see that hardware compresssion is working. ... > Using omniback the media look like DDSIII as the capacity is about 12Gb: ... You do not tell us what kind of data you send to the tape. ...
      (comp.sys.hp.hpux)