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 o9ML1Qre218173 for ; Fri, 22 Oct 2010 16:01:26 -0500 Received: from mailsrv14.zmi.at (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 8DE6F11DA53 for ; Fri, 22 Oct 2010 14:02:41 -0700 (PDT) Received: from mailsrv14.zmi.at (mailsrv1.zmi.at [212.69.164.54]) by cuda.sgi.com with ESMTP id zpQoUT8eT2d1JZsZ for ; Fri, 22 Oct 2010 14:02:41 -0700 (PDT) From: Michael Monnerie Subject: Re: cannot defrag volume, fragmentation factor 21.73% Date: Fri, 22 Oct 2010 23:02:38 +0200 References: <4CBC3910.70806@cape-horn-eng.com> <20101018231009.GL29677@dastard> <4CC1638B.4070807@cape-horn-eng.com> In-Reply-To: <4CC1638B.4070807@cape-horn-eng.com> MIME-Version: 1.0 Message-Id: <201010222302.39061@zmi.at> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============3065479620385130285==" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: xfs@oss.sgi.com Cc: Richard Ems --===============3065479620385130285== Content-Type: multipart/signed; boundary="nextPart3969359.xkFzNuiKzc"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit --nextPart3969359.xkFzNuiKzc Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable On Freitag, 22. Oktober 2010 Richard Ems wrote: > But, at which numbers should I look at before starting a defrag then? Watch the performance of your application. Record answer times with=20 munin or something, and if you ever "feel" it's too slow, look at the=20 recorded numbers again to see if your feelings fit the measurements.=20 Don't be paranoid about fragmentation. The more people access a server=20 at a time, the less important fragmentation is.=20 If you got 100 people streaming 100 perfect defragmented files, you=20 still got an access pattern that needs to move the disk head to 100=20 different positions all the time. If your single disk can't do that many=20 I/O's, build up a RAID, or get faster disks (10kprm, 15krpm, SSD). Defrag is more for single threaded I/O workloads, where one stream at a=20 time has to be read/written. Therefore it helps on a Windows PC more=20 than on a server. Only use defrag if you really have lots of chunks per=20 file. =2D-=20 mit freundlichen Gr=FCssen, Michael Monnerie, Ing. BSc it-management Internet Services http://proteger.at [gesprochen: Prot-e-schee] Tel: 0660 / 415 65 31 ****** Radiointerview zum Thema Spam ****** http://www.it-podcast.at/archiv.html#podcast-100716 // Wir haben im Moment zwei H=E4user zu verkaufen: // http://zmi.at/langegg/ // http://zmi.at/haus2009/ --nextPart3969359.xkFzNuiKzc Content-Type: application/pgp-signature; name=signature.asc Content-Description: This is a digitally signed message part. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (GNU/Linux) iEYEABECAAYFAkzB++8ACgkQzhSR9xwSCbTMCgCgnTmI5N3GT7zTldXJz6SFhR86 1rIAoO+1ExBmSRy8dIRyKpPa9S9fd9NQ =VzJT -----END PGP SIGNATURE----- --nextPart3969359.xkFzNuiKzc-- --===============3065479620385130285== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs --===============3065479620385130285==--