Messages in this thread | | | Subject | Re: Out-of-order writing by disk drives | From | Chris Mason <> | Date | Tue, 14 Apr 2009 15:27:06 -0400 |
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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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