From owner-freebsd-scsi@FreeBSD.ORG Mon Aug 4 13:10:18 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 461F637B404; Mon, 4 Aug 2003 13:10:18 -0700 (PDT) Received: from mail.sandvine.com (sandvine.com [199.243.201.138]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1E9D543F93; Mon, 4 Aug 2003 13:10:17 -0700 (PDT) (envelope-from don@sandvine.com) Received: by mail.sandvine.com with Internet Mail Service (5.5.2653.19) id <305LHJ21>; Mon, 4 Aug 2003 16:10:16 -0400 Message-ID: From: Don Bowman To: "'Justin T. Gibbs'" , Don Bowman , "'freebsd-scsi@freebsd.org'" , "'aic7xxx@freebsd.org'" Date: Mon, 4 Aug 2003 16:10:15 -0400 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="iso-8859-1" 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 20:10:18 -0000 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. How can one determine this is a CRC error? Is the reserved ASC/ASCQ something that would be in e.g. the seagate manual as a vendor specific thing?