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SubjectRe: 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



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