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    SubjectRe: Out-of-order writing by disk drives
    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.


    -- -- Speaking for myself only.

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