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From: Kalpak Shah <kalpak@clusterfs.com>
To: cmm@us.ibm.com
Cc: linux-ext4 <linux-ext4@vger.kernel.org>,
	Andreas Dilger <adilger@clusterfs.com>,
	Jean noel Cordenner <jean-noel.cordenner@bull.net>
Subject: Re: [PATCH 4/6] add noversion mount option
Date: Fri, 15 Jun 2007 03:22:06 +0530	[thread overview]
Message-ID: <1181857932.3926.4.camel@garfield> (raw)
In-Reply-To: <1181854214.3883.10.camel@dyn9047017103.beaverton.ibm.com>

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
> 
> -
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  parent reply	other threads:[~2007-06-14 21:53 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1181835073.7779.9.camel@garfield>
2007-06-14 15:56 ` [PATCH 1/6] Separated 64-bit i_version patch Kalpak Shah
2007-06-14 20:58   ` Mingming Cao
2007-06-14 21:41     ` Andreas Dilger
2007-06-14 15:56 ` [PATCH 2/6] add i_version_hi to ext4_inode Kalpak Shah
2007-06-14 15:56 ` [PATCH 3/6] Changes for 64-bit i_version Kalpak Shah
2007-06-14 15:56 ` [PATCH 4/6] add noversion mount option Kalpak Shah
2007-06-14 20:50   ` Mingming Cao
2007-06-14 21:42     ` Andreas Dilger
2007-06-14 21:52     ` Kalpak Shah [this message]
2007-06-14 22:28       ` Mingming Cao
2007-06-14 15:59 ` Kalpak Shah
2007-06-14 15:59 ` [PATCH 5/6] VFS updates to i_version Kalpak Shah
2007-06-14 15:59 ` [PATCH 6/6] Updated series file Kalpak Shah

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