From: Bernd Schubert Subject: Re: status of MMP? Date: Fri, 7 May 2010 17:14:51 +0200 Message-ID: <4BE42E6B.90405@ddn.com> References: <201005052330.49491.bs_lists@aakef.fastmail.fm> <87zl0b21ki.fsf@basil.nowhere.org> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Bernd Schubert , "linux-ext4@vger.kernel.org" , Andreas Dilger To: Andi Kleen Return-path: Received: from mail.datadirectnet.com ([74.62.46.229]:35081 "EHLO mail.datadirectnet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755343Ab0EGPUM (ORCPT ); Fri, 7 May 2010 11:20:12 -0400 In-Reply-To: <87zl0b21ki.fsf@basil.nowhere.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/07/2010 05:06 PM, Andi Kleen wrote: > Bernd Schubert 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkvkLmsACgkQqh74FqyuOzT0bwCfQQRWqaUcTM0xQ1dgyAv483t1 2fQAniCT6AWBdqJiKWQmpUMdYvEKKubW =U2NE -----END PGP SIGNATURE-----