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