From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id nBFGqa4E245619 for ; Tue, 15 Dec 2009 10:52:36 -0600 Received: from mail.sandeen.net (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 14D3119845BA for ; Tue, 15 Dec 2009 08:53:14 -0800 (PST) Received: from mail.sandeen.net (sandeen.net [209.173.210.139]) by cuda.sgi.com with ESMTP id 4BME9Zq02skqwgiA for ; Tue, 15 Dec 2009 08:53:14 -0800 (PST) Message-ID: <4B27BF03.6090602@sandeen.net> Date: Tue, 15 Dec 2009 10:53:23 -0600 From: Eric Sandeen MIME-Version: 1.0 Subject: Re: Disappointing performance of copy (MD raid + XFS) References: <4B204334.1000605@shiftmail.org> <4B207620.3060605@sandeen.net> <4B21A34C.9090100@shiftmail.org> <20091211032610.GH30608@discord.disaster> <1260895872.7209.46.camel@localhost> In-Reply-To: <1260895872.7209.46.camel@localhost> 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: Kasper Sandberg Cc: Gabor Gombas , xfs@oss.sgi.com, linux-raid , =?ISO-8859-1?Q?Kristleifur_Da=F0ason?= , Asdo Kasper Sandberg wrote: > On Fri, 2009-12-11 at 14:26 +1100, Dave Chinner wrote: >> On Fri, Dec 11, 2009 at 02:41:32AM +0100, Asdo wrote: >>> I have checked the other problem I had which I was mentioning, that I > >>> Also with noalign and rotorstep at 255 the stripe_cache_size stays >>> usually in the lower half (below 16000 out of 32000) while with defaults >>> it's stuck for most of the time at the maximum and processes are stuck >>> sleeping in MD locks for this reason. >> That really does sound like a misaligned filesystem - the stripe >> cache will grow larger the more RMW cycles that need to be >> performed... > Sorry to interrupt, I would very much like to see if my array/xfs is > properly aligned and all that stuff which has been mentioned inhere, > could any of you please post the things required to check? filesystem is > straight on md raid6, debian lenny. > > > > use xfs_info on your mountpoint, and compare the stripe unit and width to what md tells you. xfs_info stripe unit/width output is in fs blocks units. -Eric _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs