From owner-freebsd-stable Mon Nov 1 20:45:39 1999 Delivered-To: freebsd-stable@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id E57E415433 for ; Mon, 1 Nov 1999 20:45:20 -0800 (PST) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id VAA41906; Mon, 1 Nov 1999 21:44:57 -0700 (MST) (envelope-from ken) Message-Id: <199911020444.VAA41906@panzer.kdm.org> Subject: Re: scsi negotiation problem... In-Reply-To: from Jason Detar at "Nov 1, 1999 07:54:45 pm" To: jdetar@EIComm.net (Jason Detar) Date: Mon, 1 Nov 1999 21:44:57 -0700 (MST) Cc: freebsd-stable@FreeBSD.ORG From: "Kenneth D. Merry" X-Mailer: ELM [version 2.4ME+ PL54 (25)] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG [ It is generally best to send SCSI questions to the freebsd-scsi list ] Jason Detar wrote... > For some odd reason on one of my boxes the SCSI devices are coming up as > scsi-3 40MB/sec instead of 80MB/sec Ultra 2/LVD. > > box2 it comes up ok... > da0 at ahc0 bus 0 target 0 lun 0 > da0: Fixed Direct Access SCSI-3 device > da0: 80.000MB/s transfers (40.000MHz, offset 31, 16bit), Tagged Queueing > Enabled > da0: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) > > but box3 has 2 hd's and comes up like this... > da1 at ahc0 bus 0 target 1 lun 0 > da1: Fixed Direct Access SCSI-3 device > da1: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing > Enabled > da1: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) > da0 at ahc0 bus 0 target 0 lun 0 > da0: Fixed Direct Access SCSI-3 device > da0: 40.000MB/s transfers (20.000MHz, offset 31, 16bit), Tagged Queueing > Enabled > da0: 8748MB (17916240 512 byte sectors: 255H 63S/T 1115C) > > The HD's are identical, so is the SCSI card and setup for it all.. would the > fact of it being 2 drive's causing this problem or what could it be? There are a number of factors that can cause this problem: - many (most?) LVD drives have a jumper that forces single-ended negotiation. - controllers like the Adaptec 2940U2W, and many motherboards that have onboard 7890's have a wide LVD connector and a wide SE connector. If your drives are plugged into the wrong connector, your drives will negotiate at the lower single-ended rate. - the BIOS settings on the card could be wrong. Make sure that the card BIOS is setup to negotiate at LVD speeds. - you might have other single-ended devices on an LVD SCSI bus segment. If there are any single-ended devices on an LVD-capable bus, the entire bus will be single ended. Also, I'm not sure what would happen if your cable were incorrectly terminated. Make sure you've got a "twisty" LVD cable with a terminator block on the end. (LVD disks don't have on-board terminators.) Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message