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software compression out - SCO

On Thu, 28 Aug 2003 16:28:58 +0200, John Kuiper <nl> wrote:   Looking at the man page for tape(C), I believe the command # tape -a 0 setcomp is what you want (no - in front of the zero) Scott McMillan...

  1. #1

    Default Re: software compression out

    On Thu, 28 Aug 2003 16:28:58 +0200, John Kuiper <nl>
    wrote:
     

    Looking at the man page for tape(C), I believe the command
    # tape -a 0 setcomp

    is what you want (no - in front of the zero)


    Scott McMillan

    Scott Guest

  2. #2

    Default Re: software compression out


    "John Kuiper" <nl> wrote in message
    news:bil3kr$41l$wxs.nl... 

    The setcomp option to the tape command controls hardware, not software
    compression. Your (unspecified) tape backup program controls software
    compression, and should be turned off if you're using a device with
    hardware compression.

    The SDT-9000 works much more slowly with DDS-1 and DDS-2 tapes
    (60,90,120m) than with DDS-3 tapes (125m).

    Bob


    Bob Guest

  3. #3

    Default Re: software compression out

    I did some tests for myself.
    The default backup program is tar. Normally the command for using backup
    is 'tar cf /dev/rStp0 <files>' or 'tar c8 <files> (witch 8 stands for
    /dev/rct0 in /etc/default/tar). In the /etc/default/tar the settings are
    set for the tape; archive8 /dev/rct0 20 0 y.
    If tape is set to n, then tar will see the tapedevice as a harddisk and
    is not using blocksizes. The files are put directly to the tape without
    software compression, but hardware compressing.
    If tape is still y but the volumesize is set to 24000000 (for example),
    the files are put directly to the tape without software compression, but
    only using hardware comression.
    On any other way (like tar cf /dev/rStp0) the files are first to be
    compressed and then put on the tape drive.

    Tell me if I have it wrong?

    John Kuiper


    Bob Bailin wrote: 
    >
    >
    > The setcomp option to the tape command controls hardware, not software
    > compression. Your (unspecified) tape backup program controls software
    > compression, and should be turned off if you're using a device with
    > hardware compression.
    >
    > The SDT-9000 works much more slowly with DDS-1 and DDS-2 tapes
    > (60,90,120m) than with DDS-3 tapes (125m).
    >
    > Bob
    >
    >[/ref]

    John Guest

  4. #4

    Default Re: software compression out


    "John Kuiper" <nl> wrote in message
    news:biv47a$1qo$wxs.nl... 
    > >
    > >
    > > The setcomp option to the tape command controls hardware, not software
    > > compression. Your (unspecified) tape backup program controls software
    > > compression, and should be turned off if you're using a device with
    > > hardware compression.
    > >
    > > The SDT-9000 works much more slowly with DDS-1 and DDS-2 tapes
    > > (60,90,120m) than with DDS-3 tapes (125m).
    > >
    > > Bob
    > >
    > >[/ref]
    >
    > I did some tests for myself.
    > The default backup program is tar. Normally the command for using backup
    > is 'tar cf /dev/rStp0 <files>' or 'tar c8 <files> (witch 8 stands for
    > /dev/rct0 in /etc/default/tar). In the /etc/default/tar the settings are
    > set for the tape; archive8 /dev/rct0 20 0 y.
    > If tape is set to n, then tar will see the tapedevice as a harddisk and
    > is not using blocksizes. The files are put directly to the tape without
    > software compression, but hardware compressing.
    > If tape is still y but the volumesize is set to 24000000 (for example),
    > the files are put directly to the tape without software compression, but
    > only using hardware comression.
    > On any other way (like tar cf /dev/rStp0) the files are first to be
    > compressed and then put on the tape drive.
    >
    > Tell me if I have it wrong?
    >
    > John Kuiper
    >
    >[/ref]

    I haven't read the tar man page in quite a while, because I don't use
    tar for backups. YOU should NOT be using tar for backups, either.
    A tar system backup is almost worthless. Please use one of the
    often mentioned supertar products at www.lone-tar.com or
    www.microlite.com for a better backup solution. Fully functional,
    time-limited trials are available for free download.

    Bob


    Bob Guest

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