On 30/09/2015 16:43, Jeff Cody wrote:
> One issue is that QEMU will do mode!='existing' && sync!='full' for
> drivers that do not support backing files (raw host devices, for
> instance).

Yup, this can be used to get a mirror of future operations (the idea was
to support things such as antiviruses, where the antivirus connects to
QEMU via NBD).

I think it's okay to ignore this case, since the resulting image is
bogus anyway.  What is interesting is only the stream of writes which
you can get through NBD.

Paolo

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