From owner-freebsd-performance@FreeBSD.ORG Wed Apr 16 21:35:59 2008 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A3D25106566B for ; Wed, 16 Apr 2008 21:35:59 +0000 (UTC) (envelope-from bmeekhof@umich.edu) Received: from tombraider.mr.itd.umich.edu (smtp.mail.umich.edu [141.211.93.161]) by mx1.freebsd.org (Postfix) with ESMTP id 5BE8D8FC20 for ; Wed, 16 Apr 2008 21:35:58 +0000 (UTC) (envelope-from bmeekhof@umich.edu) Received: FROM atom.heart.mother (c-68-40-199-244.hsd1.mi.comcast.net [68.40.199.244]) BY tombraider.mr.itd.umich.edu ID 4806713B.DCA64.29291 ; 16 Apr 2008 17:35:56 -0400 Message-ID: <4806713B.2060405@umich.edu> Date: Wed, 16 Apr 2008 17:35:55 -0400 From: "Benjeman J. Meekhof" User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: freebsd-performance@freebsd.org References: <480548CF.5080104@umich.edu> <4806221C.20202@umich.edu> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: ZFS, Dell PE2950 X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Apr 2008 21:35:59 -0000 I have some old dd numbers from when I was experimenting to find a UFS/gstripe combination that wasn't horrifyingly slow to read. I was not then adjusting filesystem blocksize, and not until moving UFS2 bs to the maximum did initial results seem worth resuming iozone tests. Raid HW stripe-width is 128k. FWIW. # using 4k stripe, same as above #gstripe label -v -s 4k test /dev/mfid0 /dev/mfid2 #newfs -U /dev/stripe/test #time dd if=/dev/zero of=/test/deletafile bs=1M count=10240 #time dd if=/test/deletafile of=/dev/null bs=1M count=10240 #write: 26.5s 403665800 bps #read: 157s 68343843 bps -Ben Ivan Voras wrote: > Ivan Voras wrote: > >> Per my discussion with Scott Long Can you repeat the test for UFS, but >> create gstripe with a really small stripe size, like 4 KB? > > Actually, no need to do that - it looks like iozone is doing quite > random IO ops so it won't help you. >