Re: [SLE] SCSI Tape compression

From: Ken Schneider (suse-list_at_bout-tyme.net)
Date: 08/12/05

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    To: suse-linux-e@suse.com
Date: Fri, 12 Aug 2005 14:27:34 -0400

    On Fri, 2005-08-12 at 14:25 -0300, Sebastian Jeremias wrote:
    > From: "Ken Schneider" <suse-list@bout-tyme.net>
    > > Just did a mtst -f /dev/st0 densities and the correct setting for DDS-4
    > > should be 0x26. The OP I believe had a code of 0x8c EXB-8505 compressed.
    > > Perhaps that is why he is having problems fitting all of his data on a
    > > single tape.
    > >
    >
    > Yes, that's exactly the problem... Yesterday I connected another DAT, that
    > was in another Solaris box. Under Solaris I do a mt status and it says
    > DDS-4. Under Suse, it says EXB-8505, just like the other DAT.
    > I already tryied to use 0x26 density, but it seems to have no effect,
    > because I do a status again and I keep seeing EXB-8505.
    > What I was asking for was the DDS-4 density in bpi, so I can pass it to
    > dump
    > as a command line parameter.
    >
    > Also tryied with stinit, but didn't work. I could change between "default"
    > (0x0) and EXB-8505 (0x8c) densities, and between compression on and off,
    > but
    > no DDS-4 at all.
    >
    > Anyway, I'm already working on a three-levels dump backup schedule :(
    > I'm starting to give up with this...
    > It could be the kernel scsi drivers or the scsi controller (but I don't
    > think so).

    I haven't used dump in a couple of years but I think I ended up trying
    different lengths until I found what would work. Started by using a
    length I knew was too much and worked back until I found one that would
    work. You can't just use the full compressed amount that the tape says
    will fit because you never get 2:1 compression. 

    -- 
Ken Schneider
UNIX  since 1989, linux since 1994, SuSE  since 1998
 "The day Microsoft makes something that doesn't suck is probably
  the day they start making vacuum cleaners." -Ernst Jan Plugge
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