From owner-freebsd-hackers  Tue Aug 11 13:30:33 1998
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From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199808111811.UAA00917@yedi.iaf.nl>
Subject: Re: EXA 8200 tape drive on FreeBSD?
In-Reply-To: <199808110035.TAA00818@nospam.hiwaay.net> from David Kelly at "Aug 10, 98 07:35:25 pm"
To: dkelly@hiwaay.net (David Kelly)
Date: Tue, 11 Aug 1998 20:11:46 +0200 (CEST)
Cc: se@FreeBSD.ORG, pvh@leftside.wcape.school.za, freebsd-hackers@FreeBSD.ORG
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As David Kelly wrote...
> Stefan Esser writes:
> > On 1998-08-09 17:32 +0200, Peter van Heusden <pvh@leftside.wcape.school.za> w
> > rote:
> > > However, I cannot write to it at all - even after a 'mt erase', I get the
> > > following:
> > > 
> > > bash# mt rewind
> > > bash# dd if=/kernel of=/dev/nrst0 bs=64 count=1024
> > > dd: /dev/nrst0: Input/output error
> > > 1+0 records in
> > > 0+0 records out
> > > 0 bytes transferred in 0.082043 secs (0 bytes/sec)
> > > bash# 
> > 
> > Did you try shorter transfers (less than 64KB blocks) ?
> > 
> > I seem to remember, that the EXABYTE 8200 was limited to
> > less than 64KB per block (i.e. 63KB works, but 64KB doesn't).
> 
> "bs=64" spells out 64 byte blocks, not 64k. "bs=64k" would be 64k.
> 
> There might be a problem with the block being too small.  :-)
> 
> SGI Irix defaults to 128k blocks on Exabyte 8mm drives, including the 
> 8200. Its FreeBSD that won't (can't) do more than 64k.

I think the 8200 uses 1 kB blocks itself by default.

> As others have mentioned, when a new (new to you) Exabyte drive acts
> flaky its time to flash the EEPROMs or burn new EPROMs for the old 8200.
> I too have a new-to-me 8200 that ID's, rewinds, retensions, ejects, and
> all that good stuff. But doesn't work. If new EPROMs don't fix it, then
> its junk. That too is standard failure mode for an Exabyte.

Exabytes are not the most robust of devices yes..

_     ______________________________________________________________________
 |   / o / /  _  Bulte 				  email: wilko @ yedi.iaf.nl 
 |/|/ / / /( (_) Arnhem, The Netherlands          WWW:   http://www.tcja.nl
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