From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: with ECARTIS (v1.0.0; list xfs); Sun, 16 Jul 2006 02:54:14 -0700 (PDT) Received: from mondschein.lichtvoll.de (ms2.lichtvoll.de [194.150.191.235] (may be forged)) by oss.sgi.com (8.12.10/8.12.10/SuSE Linux 0.7) with ESMTP id k6G9s4DW005598 for ; Sun, 16 Jul 2006 02:54:04 -0700 Received: from localhost (dslb-084-056-110-224.pools.arcor-ip.net [84.56.110.224]) by mondschein.lichtvoll.de (Postfix) with ESMTP id 6AABFFA4F3 for ; Sun, 16 Jul 2006 11:51:41 +0200 (CEST) From: Martin Steigerwald Subject: Re: XFS and write barrier Date: Sun, 16 Jul 2006 11:53:39 +0200 References: <200607151248.56603.Martin@lichtvoll.de> <20060715192857.GA11034@tuatara.stupidest.org> In-Reply-To: <20060715192857.GA11034@tuatara.stupidest.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200607161153.40130.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 Am Samstag 15 Juli 2006 21:28 schrieb Chris Wedgwood: > On Sat, Jul 15, 2006 at 12:48:56PM +0200, Martin Steigerwald wrote: > > What are those intermittent IO errors? I googled but did not find a > > discussion of this change. > > write barriers are enabled by default now, they have been for some > months (since the end of March) Hallo Chris, yes, but for 2.6.17 which was still in development. The stable release of it appeared kernel.org on 18-Jun-2006 02:10 according to the date in the file listing there! commit 3bbcc8e3976f8bba2fd607c8850d7dfe7e332fda Author: Nathan Scott Date: Fri Mar 31 13:04:56 2006 +1000 [XFS] Reenable write barriers by default. [...] They have been in enabled but then disabled again 5 minutes later for 2.6.16 which should still be widely in use: commit 4ef19dddbaf2f24e492c18112fd8a04ce116daca Author: Christoph Hellwig Date: Wed Jan 11 15:27:18 2006 +1100 [XFS] enable write barriers by default [...] commit b04ed21a1fdbfe48ee0738519a4d1af09589dfea Author: Nathan Scott Date: Wed Jan 11 15:32:17 2006 +1100 [XFS] Disable write barriers for now till intermittent IO errors are understood. [...] Thus for end users this write barrier support by default in XFS is rather new! What I would like to know whether its safe to use write barriers with 2.6.16 or even 2.6.15 (if it is possible at all) as well (I guess there are not many distributions that shipd with 2.6.17 already) or whether one might face those "intermittent IO errors" - whatever they are - when using them. If I do not find anything more on this I will recommend 2.6.17 for XFS with write barrier usages as I am pretty much convinced that it works stable from my own experience. (See my other post.) Regards, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7