> > Sorry, but we use "cache=none", so cache is not enabled (what cache do you
> talk exactly?).
> Cache=none means no host cache but backend cache is still in use. In case of
> DRBD this is a buffer in DRBD. So O_DIRECT return OK when data reaches this
> buffer and not RAID cache.

Yes, so DRBD gets the data, and kvm send sync request when required. So I still 
not
see the problem.

Can you also reproduce the problems if you use DRBD device directly, without 
LVM on top?
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