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Date: Thu, 10 Sep 1998 11:54:26 +0300 (EEST)
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From: "Oleg V.  Naumann" <oleg@reis.zp.ua>
To: Warner Losh <imp@village.org>
Subject: Re: SCSI tape drives
Cc: questions@FreeBSD.ORG, "Chad R. Larson" <chad@freebie.dcfinc.com>
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On 10-Sep-98 Warner Losh wrote:
> In message <XFMail.980910103447.oleg@reis.zp.ua> "Oleg V. Naumann" writes:
>:         Seagate Travan TR-4 (SCSI) do not properly detect eom (End Of Media).
> 
> Nor do any of the other scsi tape drives, iirc.  At least the driver
> doesn't.

        In FreeBSD-1.1.* times my old external Archive Viper 150
SCSI-1 on Adaptec AHA-1542 does this :-(

> 
>: So 
>: dump [0-9]auf /dev/nrst[0-9] /filesystem
>:         if your dump data large then 4GB (multitape dump) failed.
>: 
>: However, value of B option for Travan TR-4 unknown for me :-(
> 
> I've been using B 4000000 and that seems to work, but I don't have a
> file system that forces a multiple tape dump.  The TR-4 tape drives
> are 4G, which likely means 4000000000 bytes, more or less.  B 4000000
> gives 4096000000 bytes.  If you wanted to specify 4000000000 bytes, a
> B of 3906250 would do the trick.  dd if=/dev/zero of=/dev/tape
> bs=<size used for dump> will tell you too, but you may need to convert
> the number reported into 1024 byte units.

        Thank you

> 
> Warner

        With best wishes
        Oleg V. Naumann

P.S. Sorry, I'm not in -questions, so please Cc: for me any postings
in this thread.

        Oleg


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