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From: michaelv@MindBender.HeadCandy.com (Michael L. VanLoon)
Newsgroups: comp.os.386bsd.questions
Subject: Re: Disapearing Disks?
Date: 01 Sep 1994 06:19:50 GMT
Organization: HeadCandy Associates... Playing with your mind
Lines: 40
Message-ID: <MICHAELV.94Sep1011951@MindBender.HeadCandy.com>
References: <341uf9$d4@shore.shore.net> <CvFBMt.4LE@dtr.com>
NNTP-Posting-Host: stingray.cc.iastate.edu
In-reply-to: bmk@dtr.com's message of Wed, 31 Aug 1994 23:52:04 GMT
In article <341uf9$d4@shore.shore.net>, Robert Withrow <witr@rwwa.com> wrote:
>Recently I have been experencing a situation where, after the system
>has been running for a while one or more if the disks will cease to
>be available and I get a ``Unit Attention'' on them, and they become
>de-configured. Note: by ``running for a while'' I mean running for
>a while after being re-booted. The system is *never* turned off for
>more than a few seconds, so the problem doesn't seem to be heat
>related.
Have you tried removing everything, and cleaning everything? Like,
take a pencil eraser and (carefully) scrub all the contacts clean on
all your bus cards, then (very carefully -- watch that static!!!) do
the same to your SIMMs. This solved some intermitant problems for me
a while back.
>I have
>carefully configured the scsi bus so that <5 targets are supplying
>terminator power. The cable is custom, since no one makes a scsi cable
>with 5 connectors.
Ummm... I believe you have terminating power on about two too many
devices. You should have only *two* devices terminated: both of the
extreme ends of the SCSI chain; *nothing* in the middle of the chain
should be terminated. (This is the physical chain of devices, not the
logical ID numbers.) I believe you should only have terminating power
on those two devices (though it might not matter much if you have the
terminator turned off).
You might also try changing which devices are in the middle, and which
devices are on the ends to see if they act any differently. But make
sure you change the termination so it's set up correctly as above if
you do so.
--
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Michael L. VanLoon michaelv@HeadCandy.com michaelv@iastate.edu
Free your mind and your machine -- NetBSD free un*x for PC/Mac/Amiga/etc.
Working NetBSD ports: 386+PC, Mac, Amiga, HP300, Sun3, Sun4c, PC532
In progress: DEC pmax (MIPS R2k/3k), VAX, Sun4m
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