From owner-freebsd-scsi Wed Jan 12 10:55:17 2000 Delivered-To: freebsd-scsi@freebsd.org Received: from panzer.kdm.org (panzer.kdm.org [216.160.178.169]) by hub.freebsd.org (Postfix) with ESMTP id 9CC70150C6 for ; Wed, 12 Jan 2000 10:55:10 -0800 (PST) (envelope-from ken@panzer.kdm.org) Received: (from ken@localhost) by panzer.kdm.org (8.9.3/8.9.1) id LAA90787; Wed, 12 Jan 2000 11:54:57 -0700 (MST) (envelope-from ken) Date: Wed, 12 Jan 2000 11:54:57 -0700 From: "Kenneth D. Merry" To: Andrew Gallatin Cc: mjacob@feral.com, freebsd-scsi@FreeBSD.ORG Subject: Re: 68 <-> 80 pin SCSI converter Message-ID: <20000112115457.A90747@panzer.kdm.org> References: <14460.38703.454117.921172@grasshopper.cs.duke.edu> <14460.51878.772844.467809@grasshopper.cs.duke.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 1.0i In-Reply-To: <14460.51878.772844.467809@grasshopper.cs.duke.edu>; from gallatin@cs.duke.edu on Wed, Jan 12, 2000 at 01:41:58PM -0500 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Wed, Jan 12, 2000 at 13:41:58 -0500, Andrew Gallatin wrote: > Matthew Jacob writes: > > > > > > > > I apologize for what may be a fairly silly question: Is there any > > > clean way to attach a 68-pin drive to an 80-pin SCA backplane? > > > > > > My group is purchasing a server-class box which comes with an U2 > > > hot-pluggable backplane with 80-pin SCA connectors. We are hoping > > > to reuse some existing 68-pin U2 cheetahs from another machine. > > > > > > I have looked for 68-80 pin converters for a while & all I can find > > > are adapters which allow you to attach an 80-pin SCA drive to a 68-pin > > > cable. I have not found any method for attaching a 68-pin drive to an > > > 80-pin SCA backplane. Does such a best exist? > > > > I'd try http://www.amp.com to get a part no, if it exists, and then search > > around for someone who'll sell it. I'd also check Kingston- the folks who > > make slide rail carriers may have this. > > > > I'd doubt that this is a great idea because the whole point of SCA is it > > combines signal power and mounting in one deal- to go form SCA, you'll > > have to come out with both the MOLEX +5/+12 connector, the 68 pin cable > > connector, and it won't necessarily have the right mounting and any length > > of 68 pin longer than 50mm is gonna add signal noise. > > > > OK, I haven't been able to find any connectors & your argument against > doing it even if it were possible sounds valid. I'll see if I can get > the powers that be to purchase new drives too. Well, if you look here: http://www.scsi-cables.com/line/scaadapt.htm They have adapters that go from 68-pin wide to a 80-pin SCA backplane. Here's the description: "Adapter assembly used to attach a "normal" 68-pin WIDE drive to an SCA 80-pin back plane, converting the 68-pin SCSI I/O, drive ID headers, and power to the SCA 80-pin adapter, which plugs directly onto the SCA backplane. Ideal for using normally configured WIDE drives onto an SCA host system. Specify length. (-XX)." Of course I have no idea how well it would work. I've got a couple of SCA drives with adapters to go to 68-pin + power, but I haven't ever done the reverse. Ken -- Kenneth Merry ken@kdm.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message