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Message-ID: <4BE42E6B.90405@ddn.com>
Date:	Fri, 7 May 2010 17:14:51 +0200
From:	Bernd Schubert <bschubert@....com>
To:	Andi Kleen <andi@...obates.de>
CC:	Bernd Schubert <bs_lists@...ef.fastmail.fm>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Andreas Dilger <andreas.dilger@...cle.com>
Subject: Re: status of MMP?

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On 05/07/2010 05:06 PM, Andi Kleen wrote:
> Bernd Schubert <bs_lists@...ef.fastmail.fm> writes:
> 
>>
>> Lustres ldiskfs already has MMP support for several years and I would like to 
>> know what is the blocker for ext4? Updating the MMP patches for ext4-git 
>> should be fairly simple.
> 
> AFAIK simply nobody has done the work and submitted it.
> 
> Simply adding it would break LVM snapshots though, so there's a 
> compatibility issue.

Well, firstly, you are not forced to enable MMP. And then, I don't
understand what should be the issue with MMP. We use snapshots + ldiskfs
+ MMP all the time.


I have a basic understanding how the MMP code works, but not as thorough
as the Orcacle Lustre team. Andreas, would you mind if I post updated
patches here?

Cheers,
Bernd
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