Date: Fri, 15 Oct 1999 12:51:07 +0100 From: Geoff Buckingham <geoffb@chuggalug.clues.com> To: "Kenneth D. Merry" <ken@kdm.org> Cc: Joao Pagaime <jpsp@rccn.net>, scsi@FreeBSD.ORG Subject: Re: FreeBSD 3.2 / Slow SCSI Dell PowerEdge 4300 Message-ID: <19991015125107.A56477@chuggalug.clues.com> In-Reply-To: <199910142255.QAA46124@panzer.kdm.org>; from Kenneth D. Merry on Thu, Oct 14, 1999 at 04:55:45PM -0600 References: <Pine.BSF.4.10.9910141552550.15842-100000@atlas.rccn.net> <199910142255.QAA46124@panzer.kdm.org>
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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
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