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Message-ID: <20090415124601.GM5178@kernel.dk> Date: Wed, 15 Apr 2009 14:46:01 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: Chris Mason <chris.mason@...cle.com> Cc: Andi Kleen <andi@...stfloor.org>, Michael Tokarev <mjt@....msk.ru>, Mark Lord <lkml@....ca>, Anton Ertl <anton@...s.complang.tuwien.ac.at>, linux-kernel@...r.kernel.org, agk@...hat.com Subject: Re: Out-of-order writing by disk drives On Tue, Apr 14 2009, Chris Mason wrote: > 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 Alasdair promised to push the remaining barrier bits for 2.6.30, so hopefully it should all be in working order Real Soon Now. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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