Date: 09 Dec 1999 12:55:34 -0500 From: Randell Jesup <rjesup@wgate.com> To: Shaun Jurrens <shamz@login2.powertech.no> Cc: Harlan Stenn <Harlan.Stenn@pfcs.com>, freebsd-scsi@FreeBSD.ORG, freebsd-stable@FreeBSD.ORG Subject: Re: SCSI problem ... OS or just bus? Message-ID: <ybun1rkj8x5.fsf@jesup.eng.tvol.net.jesup.eng.tvol.net> In-Reply-To: Shaun Jurrens's message of "Thu, 9 Dec 1999 12:21:55 %2B0100" References: <19991209115148.A10267@shamz.net> <707.944736910@brown.pfcs.com> <19991209122155.B10267@shamz.net>
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Shaun Jurrens <shamz@login2.powertech.no> 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
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