From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p0EJnJpg078832 for ; Fri, 14 Jan 2011 13:49:20 -0600 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id DE05B15408D5 for ; Fri, 14 Jan 2011 11:51:34 -0800 (PST) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id raCfIA5nCUy8uzta for ; Fri, 14 Jan 2011 11:51:34 -0800 (PST) Received: from [192.168.100.53] (gffx.hardwarefreak.com [192.168.100.53]) by greer.hardwarefreak.com (Postfix) with ESMTP id 749466C130 for ; Fri, 14 Jan 2011 13:51:33 -0600 (CST) Message-ID: <4D30A945.4060000@hardwarefreak.com> Date: Fri, 14 Jan 2011 13:51:33 -0600 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: extremely slow write performance plaintext References: <3205_1294953756_4D2F6D1C_3205_1943_1_4D2F6D1C.2060409@davisvision.com> <20110113233527.6dca104d@galadriel.home> <18993_1294964274_4D2F9632_18993_1387_1_F79CF9ADB27B2646B59221B7355263830CC143B1@NYL-EXCH1.HVHCVision.com> In-Reply-To: <18993_1294964274_4D2F9632_18993_1387_1_F79CF9ADB27B2646B59221B7355263830CC143B1@NYL-EXCH1.HVHCVision.com> 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 Cory Coager put forth on 1/13/2011 6:17 PM: > --- Physical volume --- > PV Name /dev/cciss/c1d1p1 > VG Name vg0 > PV Size 2.94 TB / not usable 1.51 MB > Allocatable yes > PE Size (KByte) 4096 > Total PE 769902 > Free PE 562351 > Allocated PE 207551 > PV UUID IAZAbk-eMNZ-puMJ-DqW1-zsC7-C0ux-66vYTN Make sure the write cache on the P600 (what size is it BTW?) is enabled and that the BBU is in working order. Also make sure the P600 is disabling the write caches on the drives themselves. Then... Mount with 'nobarrier' so XFS isn't interfering with the hardware cache performance of the P600. With barriers enabled (the default) XFS will periodically flush the cache on the RAID card causing write performance problems. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs