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From: Julian Elischer <julian@ref.tfs.com>
Message-Id: <199509211225.FAA08546@ref.tfs.com>
Subject: Re: Problems with st and HP DAT drive!
To: lars.koeller@odie.physik2.uni-rostock.de (Lars Köller)
Date: Thu, 21 Sep 1995 05:25:57 -0700 (PDT)
Cc: freebsd-questions@freefall.freebsd.org
In-Reply-To: <199509210917.LAA27328@odie.physik2.uni-rostock.de> from "Lars Köller" at Sep 21, 95 11:17:15 am
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> 
>    Hello!
> 
>    I use a 2GB HP-DAT drive for backup. 'st stat' reports the following:

st -f /dev/nrst1 stat I hope....
(default is st0)

> 
> Present Mode:   Density = X3B5/88-185A Blocksize variable
> ---------available modes---------
> Mode 0:         Density = 0x00         Blocksize variable
> Mode 1:         Density = 0x00         Blocksize variable
> Mode 2:         Density = 0x00         Blocksize variable
> Mode 3:         Density = 0x00         Blocksize variable
> 
>        After backing up  with the  level-0/1  script from GNU-tar I  try to
>    verify the tape (/dev/nrst1)
> 
> crw-r-----  2 root  operator   14,  17 Sep 21 04:54 /dev/nrst1
> crw-r-----  2 root  operator   14,  17 Sep 21 04:54 /dev/nrst1.0
> crw-r-----  1 root  operator   14,  21 Sep 15 08:58 /dev/nrst1.1
> crw-r-----  1 root  operator   14,  25 Sep 15 08:58 /dev/nrst1.2
> crw-r-----  1 root  operator   14,  29 Sep 15 08:58 /dev/nrst1.3
> crw-------  1 root  wheel      14, 536870928 Sep 15 08:58 /dev/rst1.ctl
> 
>    with tar -tf and get the following error message:
> 
> 910 : tar tv
> tar: read error on /dev/nrst1 : Input/output error
forget tar...
try st and dd

st (you know what version OS is this? mt now does all this...)


st -f /dev/nrst1 rewind
dd if=/dev/nrst1 of=/tmp/xx bs=64k count=1
ls -l /tmp/xx
(should tell you the blocksize actually written to tape)
use this blocksize for reading.....

> 
>    and on the console
> 
> st1: 51200-byte record too big
> 
>       the blocksize for tar (-b) is set to 100.  There are no problems with
>    the same  procedure on my Wangtec  525MB tape  (/dev/nrst0) but there st
>    reports a blocksize of 10240.
> 
>       Any suggestions? The manpage for st(4) says a blocksize up to 64kB is
>    allowed! 
yes.. (more on some adapters)
> 
>    Regards
> 
>    Lars
> 
> 
> --
> ______________________________________________________________________________
> Lars Köller                        E-Mail: 
> University of Rostock (Germany)       lars.koeller@odie.physik2.Uni-Rostock.DE
> Fachbereich Physik
> Universitätsplatz 3		   Phone:  +49 381/498-1665 or 498-1648
> 18051 Rostock                      Fax:    +49 381/498-1667
> 
>