From owner-freebsd-stable  Thu Apr  2 15:51:59 1998
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id PAA03688
          for freebsd-stable-outgoing; Thu, 2 Apr 1998 15:51:59 -0800 (PST)
          (envelope-from owner-freebsd-stable@FreeBSD.ORG)
Received: from bouncer.lucasdigital.com (bouncer.lucasdigital.com [207.1.122.10])
          by hub.freebsd.org (8.8.8/8.8.8) with SMTP id PAA03669
          for <freebsd-stable@freebsd.org>; Thu, 2 Apr 1998 15:51:44 -0800 (PST)
          (envelope-from mkiernan@lucasdigital.com)
Received: by bouncer.lucasdigital.com; id PAA27216; Thu, 2 Apr 1998 15:55:23 -0800
Received: from malone.kerner.com(10.5.15.15) by bouncer.lucasdigital.com via smap (3.2)
	id xma027206; Thu, 2 Apr 98 15:55:08 -0800
Received: from localhost by lucasdigital.com (8.6.9/931112-/NEWHUB)
	id PAA21602; Thu, 2 Apr 1998 15:52:43 -0800
Received: (from mkiernan@localhost)
	by moana.kerner.com (8.8.7/8.8.7) id PAA01775;
	Thu, 2 Apr 1998 15:49:01 -0800 (PST)
Date: Thu, 2 Apr 1998 15:49:01 -0800 (PST)
From: Michael Kiernan <mkiernan@lucasdigital.com>
Message-Id: <199804022349.PAA01775@moana.kerner.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
To: freebsd-stable@FreeBSD.ORG
Subject: Re: Adaptec 2940UW with two ?? UW drives...
References:  <Pine.NEB.3.95.980402134918.17645F-100000@hub.org> <35241A96.4962A670@san.rr.com>
Versions: dmail (irix) 2.1m/makemail 2.8o
Sender: owner-freebsd-stable@FreeBSD.ORG
Precedence: bulk


Doug wrote:
>Someone mentioned checking the cabling previously, did you try this?
>It seems to me that if reducing the speed helps there may be a cable
>problem. I have a 2940UW with an IBM DCAS UW drive on it and never had a
>problem.

I recently ran into such a problem.  Two UW disks and a narrow CD-ROM
on a 2940UW.  The default bios setting for the 2940UW sets the maximum
synchronous transfer rate at 20.0 MBps.  Everything ran fine until I
tried setting it to 40.0 MBps, at which point the system would hang
after recognizing all the devices.

It turned out the CD-ROM's "SCSI Termination" pins, which I had popped
a jumper on, were really used to "Disable SCSI Termination".  The
unterminated bus ran fine at 20 MBps, but choked at 40.

Mike

--
Michael Kiernan, Systems R&D, ILM    mkiernan@kerner.com +415-721-3284

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message