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From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] Using cache=writeback safely on qemu 1.4.0 and
	later
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To: Andrew Martin <amartin@xes-inc.com>
Cc: Stefan Hajnoczi <stefanha@gmail.com>, qemu-devel <qemu-devel@nongnu.org>

> > Just the lack of fdatasyncs.
> 
> I also did not see any fdatasyncs when using cache=none - would that also be
> explained by this bug?

Yes, cache=none and cache=writeback are the same as far as the _disk_ cache
is concerned, and you need fdatasyncs to flush the disk cache too.

Paolo