From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n7HLB1fY093557 for ; Mon, 17 Aug 2009 16:11:18 -0500 Received: from mailsrv1.zmi.at (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 066743D8D0D for ; Mon, 17 Aug 2009 14:11:11 -0700 (PDT) Received: from mailsrv1.zmi.at (mailsrv1.zmi.at [212.69.162.198]) by cuda.sgi.com with ESMTP id hqacrP7H4WNxRpve for ; Mon, 17 Aug 2009 14:11:11 -0700 (PDT) Received: from mailsrv.i.zmi.at (h081217106033.dyn.cm.kabsi.at [81.217.106.33]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (Client CN "mailsrv2.i.zmi.at", Issuer "power4u.zmi.at" (not verified)) by mailsrv1.zmi.at (Postfix) with ESMTP id E44635380 for ; Mon, 17 Aug 2009 23:11:08 +0200 (CEST) Received: from saturn.localnet (saturn.i.zmi.at [10.72.27.2]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by mailsrv.i.zmi.at (Postfix) with ESMTPSA id 3AD20400166 for ; Mon, 17 Aug 2009 23:11:08 +0200 (CEST) From: Michael Monnerie Subject: disk performance strange/low Date: Mon, 17 Aug 2009 23:11:07 +0200 MIME-Version: 1.0 Content-Disposition: inline Message-Id: <200908172311.07660@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com I've got an Areca RAID Controller with 5x 1TB disks, and in the last time I often found it to be strange. Now I investigated, and found this. >>From another server I NFS mount a share, and make dd if=/dev/sda of=/server/share/test.dd bs=1024k so that should do big sequential writes. But the performance goes up and down, like you see in this output from "iostat -kx 5 555". You see write KB/s is 5824, 23207, 87283, 704, 40187. Up and down all the time. Could that be solved by the patch you discussed last time, or is there something else? Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq- sz avgqu-sz await svctm %util sdb 0,00 401,20 1,20 77,09 4,78 5824,00 148,91 152,25 2595,77 12,76 99,92 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 34,77 67,03 2,20 7,21 sdb 0,00 1094,40 2,20 245,80 8,80 23207,20 187,23 153,64 43,24 4,03 100,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 41,08 56,83 0,30 15,65 sdb 0,00 295,20 6,40 791,20 25,60 87283,40 218,93 119,19 259,89 1,21 96,56 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 61,45 55,92 0,50 4,62 sdb 0,00 3,60 0,00 4,60 0,00 704,80 306,43 140,01 2979,30 217,39 100,00 avg-cpu: %user %nice %system %iowait %steal %idle 0,00 0,00 21,12 75,50 0,10 10,06 sdb 0,00 1252,80 0,20 270,00 0,80 40187,20 297,47 151,38 1160,49 3,70 99,84 mfg zmi -- // Michael Monnerie, Ing.BSc ----- http://it-management.at // Tel: 0660 / 415 65 31 .network.your.ideas. // PGP Key: "curl -s http://zmi.at/zmi.asc | gpg --import" // Fingerprint: AC19 F9D5 36ED CD8A EF38 500E CE14 91F7 1C12 09B4 // Keyserver: wwwkeys.eu.pgp.net Key-ID: 1C1209B4 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs