From owner-freebsd-current@FreeBSD.ORG Mon Oct 25 22:23:44 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id C242016A4CE for ; Mon, 25 Oct 2004 22:23:44 +0000 (GMT) Received: from vhost109.his.com (vhost109.his.com [216.194.225.101]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7552E43D45 for ; Mon, 25 Oct 2004 22:23:42 +0000 (GMT) (envelope-from brad@stop.mail-abuse.org) Received: from [10.0.1.3] (localhost.his.com [127.0.0.1]) by vhost109.his.com (8.12.11/8.12.3) with ESMTP id i9PMNbBg099501 for ; Mon, 25 Oct 2004 18:23:40 -0400 (EDT) (envelope-from brad@stop.mail-abuse.org) Mime-Version: 1.0 X-Sender: bs663385@127.0.0.1 Message-Id: In-Reply-To: <64029B30-26D2-11D9-9A2F-003065ABFD92@mac.com> References: <14479.1098695558@critter.freebsd.dk> <417D25E8.6080804@ng.fadesa.es> <200410251928.01536.victor@alf.dyndns.ws> <"200410251837.58257.Thoma s.Sparrev ohn"@btinternet.com> <417D3F12.20302@DeepCore.dk> <417D40A1.9030802@ng.fadesa.es> <417D45F1.9090504@freebsd.org> <77F3FD4D-26BE-11D9-9A2F-003065ABFD92@mac.com> <417D65F1.2040809@freebsd.org> <417D6F4C.9000404@freebsd.org> <64029B30-26D2-11D9-9A2F-003065ABFD92@mac.com> Date: Tue, 26 Oct 2004 00:23:29 +0200 To: FreeBSD-CURRENT Mailing List From: Brad Knowles Content-Type: text/plain; charset="us-ascii" ; format="flowed" Subject: Re: FreeBSD 5.3b7and poor ata performance X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Oct 2004 22:23:44 -0000 At 6:08 PM -0400 2004-10-25, Charles Swiger wrote: >>> And when you are talking about RAID-10 with a bunch of disks, you >>> will indeed start seeing bottlenecks in the bus. >> >> When you're talking about using a lot of disks, that's going to be >> true for any disk subsystem that you're trying to get a lot of >> performance out of. > > That depends on your hardware, of course. :-) See below. > There's a Sun E450 with ten disks over 5 SCSI channels in the room > next door: one UW channel native on the MB, and two U160 channels > apiece from two dual-channel cards which come with each 8-drive-bay > extender kit. You've got an average of two disks per SCSI channel, and how many disks per channel on those 8-drive bays? > It's running Solaris and DiskSuite (ODS) now, but it > would be interesting to put FreeBSD on it and see how that does, if > I ever get the chance. In my experience, ODS never performed quite as good as Vinum, but it would be very interesting to see what kind of performance you can get out of this box using FreeBSD/SPARC64. -- Brad Knowles, "Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." -- Benjamin Franklin (1706-1790), reply of the Pennsylvania Assembly to the Governor, November 11, 1755 SAGE member since 1995. See for more info.