From owner-freebsd-bugs Fri Sep 8 15:10: 7 2000 Delivered-To: freebsd-bugs@freebsd.org Received: from freefall.freebsd.org (freefall.FreeBSD.org [216.136.204.21]) by hub.freebsd.org (Postfix) with ESMTP id 96AC837B424 for ; Fri, 8 Sep 2000 15:10:03 -0700 (PDT) Received: (from gnats@localhost) by freefall.freebsd.org (8.9.3/8.9.2) id PAA58785; Fri, 8 Sep 2000 15:10:03 -0700 (PDT) (envelope-from gnats@FreeBSD.org) Date: Fri, 8 Sep 2000 15:10:03 -0700 (PDT) Message-Id: <200009082210.PAA58785@freefall.freebsd.org> To: freebsd-bugs@FreeBSD.org Cc: From: "Chris D. Faulhaber" Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Reply-To: "Chris D. Faulhaber" Sender: owner-freebsd-bugs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org The following reply was made to PR kern/21139; it has been noted by GNATS. From: "Chris D. Faulhaber" To: campt@miralink.com Cc: freebsd-gnats-submit@FreeBSD.org Subject: Re: kern/21139: IBM DNES drives need 'quirk table' entry. Date: Fri, 8 Sep 2000 18:05:07 -0400 (EDT) On Fri, 8 Sep 2000 campt@miralink.com wrote: > IBM DNES drives do not support more than 64 tagged queued commands and > the default settings for maxtags is 255 which is problematic. Under heavy > write loads this leads to a system crash. > >How-To-Repeat: > Install a DNES drive and perform disk operations. > >Fix: > Add quirk entry in cam/cam_xpt.c for this drive (see below) that limits maxtags to 32. > > { > /* DNES docs state on page 203 that this device only > * supports 64 queued commands. 9gig and 18gig devices P/N > * DNES-318350 and DNES-309170. campt@miralink.com > */ > { T_DIRECT, SIP_MEDIA_FIXED, "IBM", "DNES*","*"}, > /*quirks*/0, */mintags*/2,/*maxtags*/32 > } > Beware, the above entry also encompasses this drive: da0: Fixed Direct Access SCSI-3 device which works fine without the entry. ----- Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org -------------------------------------------------------- FreeBSD: The Power To Serve - http://www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message