From owner-aic7xxx@FreeBSD.ORG Mon Aug 4 13:27:02 2003 Return-Path: Delivered-To: aic7xxx@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 8841837B401; Mon, 4 Aug 2003 13:27:02 -0700 (PDT) Received: from magic.adaptec.com (magic-mail.adaptec.com [208.236.45.100]) by mx1.FreeBSD.org (Postfix) with ESMTP id E95D043F75; Mon, 4 Aug 2003 13:27:01 -0700 (PDT) (envelope-from scottl@freebsd.org) Received: from redfish.adaptec.com (redfish.adaptec.com [162.62.50.11]) by magic.adaptec.com (8.11.6/8.11.6) with ESMTP id h74KR1o14116; Mon, 4 Aug 2003 13:27:01 -0700 Received: from freebsd.org (hollin.btc.adaptec.com [10.100.253.56]) by redfish.adaptec.com (8.8.8p2+Sun/8.8.8) with ESMTP id NAA29889; Mon, 4 Aug 2003 13:27:01 -0700 (PDT) Message-ID: <3F2EC0F2.4040605@freebsd.org> Date: Mon, 04 Aug 2003 14:24:18 -0600 From: Scott Long User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.3) Gecko/20030414 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Wilko Bulte References: <20030804201445.GE13405@freebie.xs4all.nl> In-Reply-To: <20030804201445.GE13405@freebie.xs4all.nl> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: "'freebsd-scsi@freebsd.org'" cc: "'aic7xxx@freebsd.org'" Subject: Re: AIC7902 SCSI aborted command X-BeenThere: aic7xxx@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Adaptec Device Drivers in FreeBSD and Linux List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Aug 2003 20:27:02 -0000 Wilko Bulte wrote: > On Mon, Aug 04, 2003 at 04:10:15PM -0400, Don Bowman wrote: > >>From: Justin T. Gibbs [mailto:gibbs@scsiguy.com] >> >>>>After ~200 hours of operation a PC spit out this message: >>>> >>>>Copied 18 bytes of sense data offset 12: 0xf0 0x0 0xb 0x0 >>> >>>0x0 0x40 0xff 0xa >>> >>>>0x0 0x0 0x0 0x0 0x47 0x3 0x8 0x0 0x0 0x0 >>>>(da0:ahd0:0:0:0): WRITE(06). CDB: a 0 40 ff 80 0 >>>>(da0:ahd0:0:0:0): ABORTED COMMAND info:40ff asc:47,3 >>>>(da0:ahd0:0:0:0): Reserved ASC/ASCQ pair field replaceable unit: 8 >>>> >>>>The system has a single U320 15KRPM seagate 18GB drive in it. >>>>No other messages are present. >>> >>>This means that the target saw a CRC miscompare on a packet. CAM >>>retried the command and it succeeded. CRC errors are not unheard >>>of in U320 configurations, but at only 200 hours of load, that is >>>a little too often for comfort. >>> >>>I believe you mentioned before that you were using an extremely >>>short cable in one of your configurations. Be aware that there >>>is a minimum cable length suggested by the SCSI spec. This >>>varies depending on the capacitance rating of your cable, but >>>the shortest length allowed is 10cm (cables with less capacitance >>>need larger spacing). If your cable is shorter than this, you might >>>consider trying something longer. >> >>Me & my trusty ruler re-measured the cable, and straightened out, >>it is 10.4" tip to tail, which matches the spec. I was foolishly >>thinking of the folded length. > > > It isn't too folded I hope? In the sense that you sometimes > find flatcables stashed in miniscule cutouts in cases etc. Not > too good for signal integrity either. > Except in cases where you need to slip through a tight slot and only a flat cable will do, the new-fangled round u320 cables are superior to their flat counterparts. Scott