From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay2.corp.sgi.com [137.38.102.29]) by oss.sgi.com (Postfix) with ESMTP id 502DC7FC6 for ; Thu, 7 Mar 2013 07:52:34 -0600 (CST) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay2.corp.sgi.com (Postfix) with ESMTP id 3583F304048 for ; Thu, 7 Mar 2013 05:52:33 -0800 (PST) Received: from mail-out1.booking.com (mail-out1.booking.com [62.190.24.20]) by cuda.sgi.com with ESMTP id IUwhqqOlMtJqEnI3 (version=TLSv1 cipher=AES256-SHA bits=256 verify=NO) for ; Thu, 07 Mar 2013 05:52:32 -0800 (PST) Message-ID: <1362664376.16657.26.camel@seahawk> Subject: Re: XFS IO multiplication problem on centos/rhel 6 using hp p420i raid controllers From: Dennis Kaarsemaker Date: Thu, 07 Mar 2013 14:52:56 +0100 In-Reply-To: <513899D3.80907@hardwarefreak.com> References: <1362060736.1247.30.camel@seahawk> <20130228194023.GQ5551@dastard> <1362577992.1247.84.camel@seahawk> <20130307035737.GC6369@dastard> <1362651128.16657.13.camel@seahawk> <513891D7.4060801@hardwarefreak.com> <1362663188.16657.20.camel@seahawk> <513899D3.80907@hardwarefreak.com> Mime-Version: 1.0 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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: stan@hardwarefreak.com Cc: xfs@oss.sgi.com On Thu, 2013-03-07 at 07:44 -0600, Stan Hoeppner wrote: > On 3/7/2013 7:33 AM, Dennis Kaarsemaker wrote: > > > The "ten times as many bytes" is constant, so it is constantly writing > > ten times as much data. > > Where in the IO stack are you counting the bytes? Are 10x as many bytes > actually hitting the AGs? I.e. are you consuming 10x more (real--not > counting preallocation) space in the filesystem? Or are you simply > seeing larger IOs in flight per unit time, but the same total amount of > IO bytes? I'm counting them with vmstat, iostat and collectl as can be seen in the various outputs I've sent. I hope that answers your question as I have no idea how to see what's hitting the AG's. I am not using ten times as much space, as that wouldn't fit on the volume. -- Dennis Kaarsemaker, Systems Architect Booking.com Herengracht 597, 1017 CE Amsterdam Tel external +31 (0) 20 715 3409 Tel internal (7207) 3409 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs