From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Tue, 18 Jul 2006 01:00:14 -0700 (PDT) Received: from talk.nabble.com (www.nabble.com [72.21.53.35]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k6I802DW009575 for ; Tue, 18 Jul 2006 01:00:03 -0700 Received: from [72.21.53.38] (helo=jubjub.nabble.com) by talk.nabble.com with esmtp (Exim 4.50) id 1G2kUV-00065A-8K for linux-xfs@oss.sgi.com; Tue, 18 Jul 2006 00:59:39 -0700 Message-ID: <5374022.post@talk.nabble.com> Date: Tue, 18 Jul 2006 00:59:39 -0700 (PDT) From: Cosmo Nova Subject: Re: file system defragmentation In-Reply-To: <20060717141917.GY2114946@melbourne.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit References: <4f52331f050826001612f8e323@mail.gmail.com> <20050826101131.GA24544@ii.uib.no> <4f52331f0508260848782f240a@mail.gmail.com> <43128F82.4010004@tlinx.org> <4312913F.6040205@coremetrics.com> <43311567.3060208@tlinx.org> <5356806.post@talk.nabble.com> <20060717141917.GY2114946@melbourne.sgi.com> Sender: xfs-bounce@oss.sgi.com Errors-To: xfs-bounce@oss.sgi.com List-Id: xfs To: linux-xfs@oss.sgi.com Hi, can I summarize by saying that, XFS still partition the volume into different allocation groups, but there is NO locking. Two files may write in the same allocation group and introduce fragments? What is the maximum and typical number of allocation groups please? I can't find the numbers in the source code... And for the buffer, Is preallocation the same as delayed allocation? page cache, as I remember belongs to Linux VFS. What are the memory / disk requirement and sizing for the cache please? If a file space allocation is delayed, what is the upper bound of the delayed size? Can files of MBs, GBs being delayed allocate, and multiple channels/threads files all store in memory?? How XFS's allocation works (with number please if possible) to help tackle fragmentation? Thankyou! -- View this message in context: http://www.nabble.com/file-system-defragmentation-tf255485.html#a5374022 Sent from the Xfs - General forum at Nabble.com.