From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p11K9msU237756 for ; Tue, 1 Feb 2011 14:09:48 -0600 Received: from greer.hardwarefreak.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id ACADF162A3C4 for ; Tue, 1 Feb 2011 12:12:15 -0800 (PST) Received: from greer.hardwarefreak.com (mo-65-41-216-221.sta.embarqhsd.net [65.41.216.221]) by cuda.sgi.com with ESMTP id fSqcxjuxPj013LP2 for ; Tue, 01 Feb 2011 12:12:15 -0800 (PST) Message-ID: <4D48691C.8000006@hardwarefreak.com> Date: Tue, 01 Feb 2011 14:12:12 -0600 From: Stan Hoeppner MIME-Version: 1.0 Subject: Re: XFS Preallocation References: <155CAEA5D902E7429569DD197567724A01534D42@mail1.ad.kinetx.com> <20110128045205.GR21311@dastard> <155CAEA5D902E7429569DD197567724A01534D60@mail1.ad.kinetx.com> <20110129001700.GZ21311@dastard> <3F5ACD12257C714E9C0535D0A839171802A9B4@SC-MBX02-2.TheFacebook.com> <20110201080354.GM11040@dastard> <3F5ACD12257C714E9C0535D0A839171802AB01@SC-MBX02-2.TheFacebook.com> In-Reply-To: <3F5ACD12257C714E9C0535D0A839171802AB01@SC-MBX02-2.TheFacebook.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: Peter Vajgel Cc: Jef Fox , "xfs@oss.sgi.com" Peter Vajgel put forth on 2/1/2011 1:20 PM: > At the scale we operate it does. We have multiple variables so the number of combinations is large. We have hit every single possible hardware and software problem and problem resolution can take months if it takes days to reproduce the problem. Hardware vendors (disk, controller, motherboard manufacturers) are much more responsive when you can reproduce a problem on the fly in seconds (especially in comparative benchmarking). The tests usually run only couple of minutes. With 12x3TB (possibly multiplied by a factor of X with our new platform) it would be unacceptable to wait for writes to finish. Hi Peter, When you mention scale, you're referring to the storage back end at facebook.com, your employer, correct? -- Stan _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs