A.P. Lawrence

scsi problems

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From: bv@wjv.com (Bill Vermillion)
Subject: Re: Sco 5.0.2 SCSI Problems References: <d5848dca.0201181036.5b1d7321@posting.google.com>
Date: Fri, 18 Jan 2002 19:57:50 GMT

In article <d5848dca.0201181036.5b1d7321@posting.google.com>,
Pat Pushor <patp@crossthread.com> wrote:

>I am having a problem with the scsi bus loosing it's mind under SCO
>Openserver v5.0.2.  First, the hardware:

[details deleted - wjv]

>The system locks up tighter than a popcorn fart after enough of these
>messages fill the syslog.

:-) I'll remember that phrase.

>Another instance of the problem is a kernel panic that can't dump
>because of the scsi bus confusion.  The output of the screen, though,
>looks like:

....

>I have confirmed that the bus is configured correctly, no multiple
>ID's...I believe termination to be done properly...

>Any ideas on where to start?  These boxes are completely custom and
>ripping one apart is an option to investigate further, but are there
>any software related points that immediately come to mind?

Where to start.  With an answer to this question.

The systems are running 5.0.2 which implies they have been running
a very long time.  

So it's actually a few questions.

1) Am I correct in assuming them have been running well up until now?

2) Has anyone opened the case for any reason - eg clean the dust
out, et cetera?

3) has any new software been added.

4) has the machine been moved to a new location

5) have any significant changes been made to the location. eg new
airconditioner, new microwave oven nearby, any major electrical
work.  

I've seen all of these in one way or other cause bizarre failures.

2) opening the case could mean cables are slightly loose - or
moving them next to something which either induces a signal into
the cable, or causes the cables signal to be induced into the box
itself.  This will happen when someone decides to neaten up the
system and fold the cables on themselve and then tape them onto a
metal portion of the case.  Signal gets shorted to the case or the
folding induces errors onto itsefl.

3) sw - obvious.

4) new location - different interferences, things come loose inside
the case, or poor electricity.

5) anything like this can cause a crash.  The clue on microwaves is
often it happens at lunch time when people turn it on for lunch.

Best of luck.  There are many things to check.

It could also be just incipient failure of the SCSI controller.

-- 
Bill Vermillion - bv @ wjv . com

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