From: Mingming Cao Subject: Re: [PATCH 4/6] add noversion mount option Date: Thu, 14 Jun 2007 15:28:41 -0700 Message-ID: <1181860122.3883.20.camel@dyn9047017103.beaverton.ibm.com> References: <1181835073.7779.9.camel@garfield> <1181836579.7779.46.camel@garfield> <1181854214.3883.10.camel@dyn9047017103.beaverton.ibm.com> <1181857932.3926.4.camel@garfield> Reply-To: cmm@us.ibm.com Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: linux-ext4 , Andreas Dilger , Jean noel Cordenner To: Kalpak Shah Return-path: Received: from e33.co.us.ibm.com ([32.97.110.151]:50682 "EHLO e33.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751039AbXFNW2o (ORCPT ); Thu, 14 Jun 2007 18:28:44 -0400 Received: from d03relay04.boulder.ibm.com (d03relay04.boulder.ibm.com [9.17.195.106]) by e33.co.us.ibm.com (8.13.8/8.13.8) with ESMTP id l5EMSi1a010825 for ; Thu, 14 Jun 2007 18:28:44 -0400 Received: from d03av04.boulder.ibm.com (d03av04.boulder.ibm.com [9.17.195.170]) by d03relay04.boulder.ibm.com (8.13.8/8.13.8/NCO v8.3) with ESMTP id l5EMShFG204528 for ; Thu, 14 Jun 2007 16:28:43 -0600 Received: from d03av04.boulder.ibm.com (loopback [127.0.0.1]) by d03av04.boulder.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id l5EMShfZ019648 for ; Thu, 14 Jun 2007 16:28:43 -0600 In-Reply-To: <1181857932.3926.4.camel@garfield> Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Fri, 2007-06-15 at 03:22 +0530, Kalpak Shah wrote: > On Thu, 2007-06-14 at 13:50 -0700, Mingming Cao wrote: > > On Thu, 2007-06-14 at 21:26 +0530, Kalpak Shah wrote: > > > This patch adds a "noversion" mount option to disable inode version > > > updates. > > > > Can you explain a bit more why we need this mount option? Is it because > > of performance concern? > > Lustre requires the counter to be globally unique on the entire > filesystem and hence needs to turnoff per-inode version updates. So in > the interlock meeting on 5th June, Ted has suggested the this approach. > > "- Ted suggested having a flag in the superblock for i_version, with an > additional option of having a global counter for Lustre's requirements. > i_version would be on by default, but give users who do not use the > feature the option to turn it off and avoid any performance impact." > Right. Somehow my impression is that we have agreed to do this through tune2fs. I was just double checking if the mount option is for the Lustre use. Anyway, I am fine with a mount option. > Thanks, > Kalpak. > > > > > Mingming > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > - > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html