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 o9MABHVu164051 for ; Fri, 22 Oct 2010 05:11:18 -0500 Received: from smtprelay04.ispgateway.de (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 53A78F4D562 for ; Fri, 22 Oct 2010 03:27:41 -0700 (PDT) Received: from smtprelay04.ispgateway.de (smtprelay04.ispgateway.de [80.67.31.42]) by cuda.sgi.com with ESMTP id JMW8LDUKEqAoNJ65 for ; Fri, 22 Oct 2010 03:27:41 -0700 (PDT) Message-ID: <4CC1638B.4070807@cape-horn-eng.com> Date: Fri, 22 Oct 2010 12:12:27 +0200 From: Richard Ems MIME-Version: 1.0 Subject: Re: cannot defrag volume, fragmentation factor 21.73% References: <4CBC3910.70806@cape-horn-eng.com> <20101018231009.GL29677@dastard> In-Reply-To: <20101018231009.GL29677@dastard> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="iso-8859-1"; Format="flowed" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Dave Chinner Cc: xfs@oss.sgi.com On 10/19/2010 01:10 AM, Dave Chinner wrote: > Understand your numbers. What frag reports is how many extents there > are vs a perfect layout. It does not tell you how badly fragmented > your filesystem is. Extent-based filesystems can have > "fragmentation" like you see reported above, but not suffer at all > because the extents are large enough not to affect IO throughput. Hi Dave, I think I almost got that now. But, at which numbers should I look at before starting a defrag then? Up to now, I ran always "echo frag | xfs_db -r /dev/..." to get a = "number" that could tell me if starting a xfs_fsr was necessary. At which other numbers should I look at to see if running a xfs_fsr = defrag is necessary or not? Many thanks, Richard -- = Richard Ems mail: Richard.Ems@Cape-Horn-Eng.com Cape Horn Engineering S.L. C/ Dr. J.J. D=F3mine 1, 5=BA piso 46011 Valencia Tel : +34 96 3242923 / Fax 924 http://www.cape-horn-eng.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs