From owner-freebsd-scsi Fri Oct 15 4:51:26 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from chuggalug.clues.com (chuggalug.clues.com [194.217.82.22]) by hub.freebsd.org (Postfix) with ESMTP id 345AD1531B for ; Fri, 15 Oct 1999 04:51:15 -0700 (PDT) (envelope-from geoffb@chuggalug.clues.com) Received: (from geoffb@localhost) by chuggalug.clues.com (8.9.3/8.9.3) id MAA56505; Fri, 15 Oct 1999 12:51:07 +0100 (BST) (envelope-from geoffb) Date: Fri, 15 Oct 1999 12:51:07 +0100 From: Geoff Buckingham To: "Kenneth D. Merry" Cc: Joao Pagaime , scsi@FreeBSD.ORG Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 Message-ID: <19991015125107.A56477@chuggalug.clues.com> References: <199910142255.QAA46124@panzer.kdm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: <199910142255.QAA46124@panzer.kdm.org>; from Kenneth D. Merry on Thu, Oct 14, 1999 at 04:55:45PM -0600 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Thu, Oct 14, 1999 at 04:55:45PM -0600, Kenneth D. Merry wrote: > > Western Digital drives generally aren't that great. In fact, we have > disabled tagged queueing for most all Western Digital SCSI drives. > (including the drives you have, above) > I have been meaning to post on this subject for some time, while in my last place of employment I bought 8 Dell PowerEdge 2300s each with six drives Dell supplied Western digitals and I had really poor disk performance. I realised tagged queing was disabled for WDE* and removed the quirk from cam_xpt.c this greatly improved the performance. Much exercising of the disks also failed to cause any further problems. SAdly I have no longer work their so cannot produce revision/model numbers for the drives, they were the current 7200RPM 9GB drive. Would it be possible to refine the Western Digital quirk to be a little more specific as it does have quite an impact on performance and Dell seem to be shipping large volumes of Western Digital Drives ATM. -- GeoffB To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message