[2098] in linux-scsi channel archive
Re: DAT drive density
daemon@ATHENA.MIT.EDU (Jon Lewis)
Tue Jul 1 23:57:13 1997
Date: Tue, 1 Jul 1997 23:54:28 -0400 (EDT)
From: Jon Lewis <jlewis@inorganic5.fdt.net>
To: Clem Pryke <pryke@aupc1.uchicago.edu>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <199707010020.TAA04006@aupc1.uchicago.edu>
On Mon, 30 Jun 1997, Clem Pryke wrote:
> I am running RH Linux 4.1 on a Dell Optiplex GX Pro with AHA2940 SCSI
> contoller connected to a Seagate CDT8000R-S DAT drive.
>
> I can write tapes using "tar cf /dev/nst0 datafile" etc, and read them
> back fine. However the tapes get full after approx 1 GB. It a DDS-2 (4
> GB native) drive so this is not right.
>
> With a tape inserted "mt status" gives:
>
> SCSI 2 tape drive:
> File number=0, block number=0, partition=0.
> Tape block size 512 bytes. Density code 0x13 (DDS (61000 bpi)).
> Soft error count since last status=0
> General status bits on (41010000):
> BOT ONLINE IM_REP_EN
That's the DDS code...I get it when I put a 90M DDS tape in a DDS-2 drive.
It should be capable of holding 2-4gb depending on compression. If I had
60M tapes, it would be less. :)
> so everything looks good until I write to the tape. Afterwards "mt
> status" reports "Density code 0x13" and I am still getting 1 GB tape
> capacity.
Are you really sure you have DDS-2 tapes? They should be around 120
meter. It sounds almost like the drive is seeing DDS-1 tapes and
resetting the density on its own.
> The drive is OK. I can write 4 GB tapes in WinNT. Please help.
On the same tapes? Is NT doing compression of any kind?
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