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Message-Id: <1181857932.3926.4.camel@garfield> Date: Fri, 15 Jun 2007 03:22:06 +0530 From: Kalpak Shah <kalpak@...sterfs.com> To: cmm@...ibm.com Cc: linux-ext4 <linux-ext4@...r.kernel.org>, Andreas Dilger <adilger@...sterfs.com>, Jean noel Cordenner <jean-noel.cordenner@...l.net> Subject: Re: [PATCH 4/6] add noversion mount option 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." Thanks, Kalpak. > > Mingming > > - > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@...r.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@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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