Date: Thu, 21 Sep 1995 14:38:44 +0200 From: Lars Köller <lars.koeller@odie.physik2.uni-rostock.de> To: julian@ref.tfs.com Cc: freebsd-questions@freefall.FreeBSD.org Subject: Re: Problems with st and HP DAT drive! Message-ID: <199509211238.OAA27703@odie.physik2.uni-rostock.de> In-Reply-To: Mail from 'Julian Elischer <julian@ref.tfs.com>' dated: Thu, 21 Sep 1995 05:25:57 -0700 (PDT)
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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)
Sure, but it's mt on 2.0.5.
>
> >
> > 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.....
>
O.k. this leads to a blocksize of 51200 bytes (which is the value tar
get with the -b 100 option). But nevertheless tar isn't so bad, when you
apply the option -b 100 during read (I forgott this, sorry) everything
works well!
> >
> > 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)
> >
Thank you very much for help!
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
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