linux-kernel - Re: Out-of-order writing by disk drives

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Message-Id: <1239737226.28321.22.camel@think.oraclecorp.com>
Date:	Tue, 14 Apr 2009 15:27:06 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Michael Tokarev <mjt@....msk.ru>, Mark Lord <lkml@....ca>,
	Anton Ertl <anton@...s.complang.tuwien.ac.at>,
	linux-kernel@...r.kernel.org
Subject: Re: Out-of-order writing by disk drives

On Tue, 2009-04-14 at 20:50 +0200, Andi Kleen wrote:
> On Tue, Apr 14, 2009 at 10:09:48PM +0400, Michael Tokarev wrote:
> > Andi Kleen wrote:
> > []
> > >Where I see it as a problem is with virtualization; LVM seems to be the
> > >most sane way to manage file systems for lots of VMs and you likely
> > >want barriers there too.
> > 
> > Virtualisation is the best fit for partitionable raid1 arrays.
> > It is, in fact, what we have here -- I tested LVM but rejected
> > it because of this very issue - it does not support barriers.
> 
> It does now as of 2.6.29, as long as you only have a single
> underlying device and use dm linear.

Eric Sandeen noticed this is actually still broken:

http://lkml.org/lkml/2009/3/23/360

-chris


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