From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 11F4929DF8 for ; Tue, 11 Jun 2013 12:31:39 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay3.corp.sgi.com (Postfix) with ESMTP id A8136AC004 for ; Tue, 11 Jun 2013 10:31:38 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id dAW5DzgQcocjuviL for ; Tue, 11 Jun 2013 10:31:38 -0700 (PDT) Message-ID: <51B75EF7.40801@redhat.com> Date: Tue, 11 Jun 2013 13:31:35 -0400 From: Ric Wheeler MIME-Version: 1.0 Subject: Re: Questions about XFS References: <51B72D3D.5010206@redhat.com> <51B75C39.3030306@redhat.com> In-Reply-To: List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Stefan Ring Cc: Steve Bergman , Linux fs XFS On 06/11/2013 01:27 PM, Stefan Ring wrote: >> Let's take a simple example - a database app that does say 30 >> transactions/sec. >> >> In your example, you are extremely likely to lose up to just shy of 5 >> seconds of "committed" data - way over 100 transactions! That can be >> *really* serious amounts of data and translate into large financial loss. > Every database software will do the flushing correctly. Stefan, you are making my point because every database will do the right thing, it won't rely on ext3's magic every 5 second fsync :) Ric > >> In a second example, let's say you are copying data to disk (say a movie) at >> a rate of 50 MB/second. When the power cut hits at just the wrong time, you >> will have lost a large chunk of that data that has been "written" to disk >> (over 200MB). > But why would anyone care about that? I know that the system went down > while copying this large movie, so I'll just copy it again. _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs