From owner-freebsd-questions@FreeBSD.ORG Fri Feb 17 17:29:07 2006 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8212816A420; Fri, 17 Feb 2006 17:29:07 +0000 (GMT) (envelope-from tedm@toybox.placo.com) Received: from mail.freebsd-corp-net-guide.com (mail.web-strider.com [65.75.192.90]) by mx1.FreeBSD.org (Postfix) with ESMTP id DAE0A43D45; Fri, 17 Feb 2006 17:29:06 +0000 (GMT) (envelope-from tedm@toybox.placo.com) Received: from tedwin2k (nat-rtr.freebsd-corp-net-guide.com [65.75.197.130]) by mail.freebsd-corp-net-guide.com (8.11.1/8.11.1) with SMTP id k1HHT6u21140; Fri, 17 Feb 2006 09:29:06 -0800 (PST) (envelope-from tedm@toybox.placo.com) From: "Ted Mittelstaedt" To: "Mark Ovens" , Date: Fri, 17 Feb 2006 09:29:06 -0800 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506 In-Reply-To: <43F5EBE5.9000904@freebsd.org> Importance: Normal Cc: Subject: RE: 80 pin SCSI hard drives. X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 17 Feb 2006 17:29:07 -0000 Mark, The problem you have with the 80-pin to 68-pin adapters is this. A lot of the el-cheapo adapters do not terminate the unconnected data lines, that is when you get instability. The better quality adapters do terminate them and don't have instability problems. Ted >-----Original Message----- >From: owner-freebsd-questions@freebsd.org >[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Mark Ovens >Sent: Friday, February 17, 2006 7:30 AM >To: freebsd-questions@freebsd.org >Subject: Re: 80 pin SCSI hard drives. > > >Alfredo Finelli wrote: >> I have 80 pin SCSI discs mounted in hot-swappable trays on a SCSI >> backplane which takes care also of powering them up and of SCSI >> termination. This is one way of using them. >> >> I also have the same drives in a different system connected >to normal SCSI >> LVD cable using small adaptors which have an 80 pin receptacle on one >> side and a 68 pin SCSI connector plus 4 pin molex power >connector on the >> other, as well as jumpers to define SCSI id. In this second case you >> have to provide the required termination of the SCSI bus >(e.g. using the >> right terminated SCSI cable). >> > >So you can confirm that using these adaptors works OK? When I bought my >SCSI drive (off eBay) there were more SCA drives for sale than 68-pin >but doing some research about 80->68 pin adaptors I found a lot of >people saying not to use them, including Adaptec: > >This from Adaptec's ASK knowledgebase http://tinyurl.com/b3ofa > >"Although there are adapters on the market converting 80 pin to 68 pin >they are not supported by Adaptec or the hard drive >manufacturers. These >convertors can cause loss of signal integrity that may result in >connectivity issues and data loss." > >This put me off getting a SCA drive. Now I'm looking for a >another drive >and SCA ones seem to be cheaper on eBay. > >Regards, > >Mark >_______________________________________________ >freebsd-questions@freebsd.org mailing list >http://lists.freebsd.org/mailman/listinfo/freebsd-questions >To unsubscribe, send any mail to >"freebsd-questions-unsubscribe@freebsd.org" > >-- >No virus found in this incoming message. >Checked by AVG Free Edition. >Version: 7.1.375 / Virus Database: 267.15.10/263 - Release >Date: 2/16/2006 >