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 q47GiCGp095100 for ; Mon, 7 May 2012 11:44:12 -0500 Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id NQYt2xQLB7TOHTkJ for ; Mon, 07 May 2012 09:44:11 -0700 (PDT) Message-ID: <4FA7FBDC.9070308@hardwarefreak.com> Date: Mon, 07 May 2012 11:44:12 -0500 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: suddenly slow writes on XFS Filesystem References: <4FA63DDA.9070707@profihost.ag> <20120507013456.GW5091@dastard> <4FA76E11.1070708@profihost.ag> (sfid-20120507_095413_656560_122EB192) <201205071021.14478.Martin@lichtvoll.de> In-Reply-To: <201205071021.14478.Martin@lichtvoll.de> Reply-To: stan@hardwarefreak.com 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 Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Martin Steigerwald Cc: Stefan Priebe - Profihost AG , xfs@oss.sgi.com On 5/7/2012 3:21 AM, Martin Steigerwald wrote: > Am Montag, 7. Mai 2012 schrieb Stefan Priebe - Profihost AG: >> after deleting 400GB it was faster. Now there are still 300GB free but >> it is slow as hell again ;-( > > Well, before you had 200 GB free, now you have 300 GB free. Thats not that > much more. You have 5 AGs, so if distributed evenly it would be 40 to 60 > GB free space per AG. > > The 10% Dave recommended of 4,6 TB would be 460 GB. As I mentioned, increasing the size of the free space pool will only help for a short duration. Most of the files Stefan is deleting are small files. Thus he's simply punching out small holes of free space, which is the problem he already has. Now if he could delete a handful of large files (10GB+) that are mostly contiguous now, that would help quite a bit, as the resulting free space wouldn't be horribly fragmented. So the takeaway is that simply deleting files to get more space isn't the right way to go. Deleting larger files that are currently contiguous is the way to go. At least for some temporary breathing room. The "permanent" solution I described in another reply. -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs