From owner-freebsd-hackers Sun Dec 5 14:39:25 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12]) by hub.freebsd.org (Postfix) with ESMTP id 49F6414A0A for ; Sun, 5 Dec 1999 14:39:19 -0800 (PST) (envelope-from wilko@yedi.iaf.nl) Received: from yedi.iaf.nl (uucp@localhost) by uni4nn.gn.iaf.nl (8.9.2/8.9.2) with UUCP id XAA27525; Sun, 5 Dec 1999 23:28:15 +0100 (MET) Received: (from wilko@localhost) by yedi.iaf.nl (8.9.3/8.9.3) id WAA74217; Sun, 5 Dec 1999 22:50:26 +0100 (CET) (envelope-from wilko) From: Wilko Bulte Message-Id: <199912052150.WAA74217@yedi.iaf.nl> Subject: Re: Strange SCSI sickness In-Reply-To: from Kelly Yancey at "Dec 5, 1999 4:15:51 pm" To: kbyanc@posi.net (Kelly Yancey) Date: Sun, 5 Dec 1999 22:50:26 +0100 (CET) Cc: jkh@zippy.cdrom.com, dseg@texar.com, billf@chc-chimes.com, rfg@monkeys.com, freebsd-hackers@FreeBSD.ORG X-Organisation: Private FreeBSD site - Arnhem, The Netherlands X-pgp-info: PGP public key at 'finger wilko@freefall.freebsd.org' X-Mailer: ELM [version 2.4ME+ PL43 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG As Kelly Yancey wrote ... > > > > 3b) Examination of the drive(s) in question for any cooling or > > mounting deficiencies. Depending on the SCSI errors in question, > > I might even investigate firmware updates for the drive(s). > > > > I actually used to get these *exact* errors a couple of years ago on > various 2.x systems. At first, I had assumed a bug in the driver (the ahc > driver was noted as still having some bugs at the time, if I recall > correctly). The errors would rare (every month or so, but they would come > in batches). I kept upgrading, from 2.1.5, through 2.2.5 hoping that the > errors would go away. Now, my ignorance being point out, it turned out > that the errors were actually heat-induced. Another interesting cause for problems is duff powersupplies. As the proverb goes "every machine is as good as it's PSU". E.g. I just struggeled with a DLT tape unit that inexplicable reset itself. After examining the 5Volts rail with a scope I found glitches on it whenever the drive did a bit of rewinding (dropping out of streaming mode). Had me stumped for a while. W/ -- | / o / / _ Arnhem, The Netherlands - The FreeBSD Project |/|/ / / /( (_) Bulte WWW : http://www.tcja.nl http://www.freebsd.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message