From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id BADB729DF8 for ; Sat, 15 Jun 2013 19:11:39 -0500 (CDT) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 9D9E28F804B for ; Sat, 15 Jun 2013 17:11:36 -0700 (PDT) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [150.101.137.131]) by cuda.sgi.com with ESMTP id rX5flF9gYE9y4Abb for ; Sat, 15 Jun 2013 17:11:31 -0700 (PDT) Date: Sun, 16 Jun 2013 10:11:30 +1000 From: Dave Chinner Subject: Re: definitions for /proc/fs/xfs/stat Message-ID: <20130616001130.GE29338@dastard> References: <91017249.1356192.1371248207334.JavaMail.root@redhat.com> <504625587.1365681.1371255450937.JavaMail.root@redhat.com> <20130615020414.GB29338@dastard> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: 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 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Mark Seger Cc: Nathan Scott , xfs@oss.sgi.com On Sat, Jun 15, 2013 at 12:22:35PM -0400, Mark Seger wrote: > I was thinking a little color commentary might be helpful from a > perspective of what the functionally is that's driving the need for > fallocate. I think I mentioned somewhere in this thread that the > application is OpenStack Swift, which is a highly scalable cloud object > store. I'm familiar with it and the problems it causes filesystems. What application am I talking about here, for example? http://oss.sgi.com/pipermail/xfs/2013-June/027159.html Basically, Swift is trying to emulate Direct IO because python does't support Direct IO. Hence Swift is hacking around that problem and causing secondary issues that would never have occurred if Direct IO was used in the first place. Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs