From owner-freebsd-scsi@FreeBSD.ORG Mon Aug 4 13:14:48 2003 Return-Path: Delivered-To: freebsd-scsi@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id ACB0037B405; Mon, 4 Aug 2003 13:14:48 -0700 (PDT) Received: from freebie.xs4all.nl (freebie.xs4all.nl [213.84.32.253]) by mx1.FreeBSD.org (Postfix) with ESMTP id 0FCC943F85; Mon, 4 Aug 2003 13:14:47 -0700 (PDT) (envelope-from wkb@freebie.xs4all.nl) Received: from freebie.xs4all.nl (localhost [127.0.0.1]) by freebie.xs4all.nl (8.12.9/8.12.9) with ESMTP id h74KEjJJ013537; Mon, 4 Aug 2003 22:14:45 +0200 (CEST) (envelope-from wkb@freebie.xs4all.nl) Received: (from wkb@localhost) by freebie.xs4all.nl (8.12.9/8.12.9/Submit) id h74KEjGq013536; Mon, 4 Aug 2003 22:14:45 +0200 (CEST) Date: Mon, 4 Aug 2003 22:14:45 +0200 From: Wilko Bulte To: Don Bowman Message-ID: <20030804201445.GE13405@freebie.xs4all.nl> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.1i X-OS: FreeBSD 4.8-STABLE X-PGP: finger wilko@freebsd.org cc: "'freebsd-scsi@freebsd.org'" cc: "'aic7xxx@freebsd.org'" Subject: Re: AIC7902 SCSI aborted command X-BeenThere: freebsd-scsi@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: SCSI subsystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Aug 2003 20:14:49 -0000 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. -- Wilko