From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Sun, 16 Jul 2006 10:33:58 -0700 (PDT) Received: from amanpulo.hosting.qsr.com.ph (amanpulo.hosting.qsr.com.ph [64.34.170.22]) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k6GHXMDW015224 for ; Sun, 16 Jul 2006 10:33:22 -0700 Received: from localhost (localhost [127.0.0.1]) by amanpulo.hosting.qsr.com.ph (Postfix) with ESMTP id C1F71C06F478 for ; Mon, 17 Jul 2006 01:32:49 +0800 (PHT) Received: from musang.free.net.ph (amanpulo.hosting.qsr.com.ph [64.34.170.22]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by amanpulo.hosting.qsr.com.ph (Postfix) with ESMTP id 54DE5C0001FD for ; Mon, 17 Jul 2006 01:32:42 +0800 (PHT) Date: Mon, 17 Jul 2006 01:32:38 +0800 From: Federico Sevilla III Subject: Re: XFS and write barrier Message-ID: <20060716173238.GD3417@free.net.ph> References: <200607151248.56603.Martin@lichtvoll.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200607151248.56603.Martin@lichtvoll.de> Sender: xfs-bounce@oss.sgi.com Errors-To: xfs-bounce@oss.sgi.com List-Id: xfs To: linux-xfs@oss.sgi.com On Sat, Jul 15, 2006 at 12:48:56PM +0200, Martin Steigerwald wrote: > I am currently gathering information to write an article about journal > filesystems with emphasis on write barrier functionality, how it > works, why journalling filesystems need write barrier and the current > implementation of write barrier support for different filesystems. Cool! Would you by any chance have information on the interaction between journal filesystems with write barrier functionality, and software RAID (md)? Based on my experience with 2.6.17, XFS detects that the underlying software RAID 1 device does not support barriers and therefore disables that functionality. Cheers! --> Jijo -- Federico Vicente C. Sevilla III Information Technology Consultant Q Software Research Corporation Website: http://jijo.free.net.ph