linux-ext4 - Re: [PATCH 4/6] add noversion mount option

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Message-Id: <1181860122.3883.20.camel@dyn9047017103.beaverton.ibm.com>
Date:	Thu, 14 Jun 2007 15:28:41 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Kalpak Shah <kalpak@...sterfs.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 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
> > 
> > -
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