Received: with ECARTIS (v1.0.0; list xfs); Tue, 08 Aug 2006 16:36:25 -0700 (PDT) Received: from larry.melbourne.sgi.com (larry.melbourne.sgi.com [134.14.52.130]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with SMTP id k78NZhDW026095 for ; Tue, 8 Aug 2006 16:35:56 -0700 Received: from snort.melbourne.sgi.com (snort.melbourne.sgi.com [134.14.54.149]) by larry.melbourne.sgi.com (950413.SGI.8.6.12/950213.SGI.AUTOCF) via ESMTP id JAA08569; Wed, 9 Aug 2006 09:34:59 +1000 Received: from snort.melbourne.sgi.com (localhost [127.0.0.1]) by snort.melbourne.sgi.com (SGI-8.12.5/8.12.5) with ESMTP id k78NYQEo49006990; Wed, 9 Aug 2006 09:34:27 +1000 (AEST) Received: (from dgc@localhost) by snort.melbourne.sgi.com (SGI-8.12.5/8.12.5/Submit) id k78NYPxb49195151; Wed, 9 Aug 2006 09:34:25 +1000 (AEST) Date: Wed, 9 Aug 2006 09:34:25 +1000 From: David Chinner To: Cosmo Nova Cc: linux-xfs@oss.sgi.com Subject: Re: file system defragmentation Message-ID: <20060808233425.GQ2114946@melbourne.sgi.com> References: <4f52331f050826001612f8e323@mail.gmail.com> <20050826101131.GA24544@ii.uib.no> <4f52331f0508260848782f240a@mail.gmail.com> <43112C5D.8090202@sgi.com> <20050828034108.73921.qmail@web34103.mail.mud.yahoo.com> <5408752.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5408752.post@talk.nabble.com> User-Agent: Mutt/1.4.2.1i X-archive-position: 8603 X-ecartis-version: Ecartis v1.0.0 Sender: xfs-bounce@oss.sgi.com Errors-to: xfs-bounce@oss.sgi.com X-original-sender: dgc@sgi.com Precedence: bulk X-list: xfs Content-Length: 556 Lines: 18 On Wed, Jul 19, 2006 at 09:23:42PM -0700, Cosmo Nova wrote: > > what is the maximum tolerance for the delayed allocations pls? I guess it's > not possible to buf a GB size file and delay its allocation? Sure it is. The limit on how much is buffered before writeback (and therefore allocation) is determined by how much memory you have and your /proc/sys/vm/dirty* tunable settings. This can range from a few MB to a few TB of data depending on how big your machine is ;) Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group