From owner-freebsd-hackers  Tue Mar 30 11: 8:24 1999
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From: Wilko Bulte <wilko@yedi.iaf.nl>
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Subject: Re: another ufs panic..
In-Reply-To: <3.0.6.32.19990330083127.007bf2f0@192.168.255.1> from Bob Bishop at "Mar 30, 1999  8:31:27 am"
To: rb@gid.co.uk (Bob Bishop)
Date: Tue, 30 Mar 1999 20:40:20 +0200 (CEST)
Cc: avalon@coombs.anu.edu.au, dillon@apollo.backplane.com,
	jkh@zippy.cdrom.com, hackers@FreeBSD.ORG
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As Bob Bishop wrote ...
> At 17:53 29/03/99 -0800, Matthew Dillon wrote:
> >    Generally speaking, glitches will cause SCSI bus parity errors.  Maybe

    "Generally" that is true... ;-) I'm just playing the devil's advocate
a bit here.

> >    not all glitches, but a high enough percentage that you usually get
> >    some sort of indication that there is a problem.

	True. But I've heard stories about PCI bridge chips in combination
with specific adapter firmware revs corrupting data. In general, everything in
the datapath can cause you grief. With the crappy PC hardware out there
(and/or overclocked crappy PC h/w to make it worse) anything is possible.
Even without SCSI.

> ...always assuming, of course, that you don't have parity checking turned
> off in the controller config :-)

	There is single word to describe that idea: "stupid" 

Groeten / Cheers,
Wilko
_     ______________________________________________________________________
 |   / o / /  _  				Arnhem, The Netherlands
 |/|/ / / /( (_) Bulte 				WWW  : http://www.tcja.nl
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