Comment 6 for bug 959637
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| Daniel Berrange (berrange) wrote Re: libvirt disk option "cache=none" prevents VM from booting | #6 |
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1b1ed1a
(Get the code!)
So what we'll want todo then, is to have Nova do a check whether the storage volume supports Direct IO. If it does, then use cache=none, otherwise fallback to cache=writethrough which does not use Direct I/O, but is still crash safe.