From owner-freebsd-stable Thu Dec 9 9:55:45 1999 Delivered-To: freebsd-stable@freebsd.org Received: from mail.tvol.com (mail.wgate.com [38.219.83.4]) by hub.freebsd.org (Postfix) with ESMTP id 4E65E155E5; Thu, 9 Dec 1999 09:55:39 -0800 (PST) (envelope-from rjesup@wgate.com) Received: from jesup.eng.tvol.net (jesup.eng.tvol.net [10.32.2.26]) by mail.tvol.com (8.8.8/8.8.3) with ESMTP id MAA14412; Thu, 9 Dec 1999 12:55:05 -0500 (EST) Reply-To: Randell Jesup To: Shaun Jurrens Cc: Harlan Stenn , freebsd-scsi@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: SCSI problem ... OS or just bus? References: <19991209115148.A10267@shamz.net> <707.944736910@brown.pfcs.com> <19991209122155.B10267@shamz.net> From: Randell Jesup Date: 09 Dec 1999 12:55:34 -0500 In-Reply-To: Shaun Jurrens's message of "Thu, 9 Dec 1999 12:21:55 +0100" Message-ID: X-Mailer: Gnus v5.6.43/Emacs 20.4 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Shaun Jurrens writes: >On Thu, Dec 09, 1999 at 05:55:10AM -0500, Harlan Stenn wrote: >#> Is the SCSI chain too long? >#> >#> H >There are only three drives internally with extra cooling on the flat band >cable connected to the wide bus. The cable is ca. 30cm long. AFAIK, the scsi >wide bus will work up to 1.3m, or maybe it was 3m, in any case the cable isn't >too long. It all worked perfectly up until about the end of June, actually. >The bugs seemed too random to put my finger on it, although I have really >tried everything. I've seen SCSI cables go bad (usually after handling/plugging/etc, but sometimes apparently randomly, even in the days of 5MB/s 8-bit SCSI). The effects can be very strange. Also, active terminators could go bad or get damaged, etc (quite less likely). Another common often-forgotten failure mode is a power-supply problem. I've seen drives that will spin up and talk, and when you try to get them to read/seek, they'd reset or even head-crash - until you moved them to another power supply. -- Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team ('88-94) rjesup@wgate.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message