Date: Thu, 2 Apr 1998 15:49:01 -0800 (PST) From: Michael Kiernan <mkiernan@lucasdigital.com> To: freebsd-stable@FreeBSD.ORG Subject: Re: Adaptec 2940UW with two ?? UW drives... Message-ID: <199804022349.PAA01775@moana.kerner.com> References: <Pine.NEB.3.95.980402134918.17645F-100000@hub.org> <35241A96.4962A670@san.rr.com>
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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
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