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Re: [Qemu-block] [Qemu-devel] [PATCH 3/3] block: mirror - zero unallocat


From: Paolo Bonzini
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 3/3] block: mirror - zero unallocated target sectors when zero init not present
Date: Wed, 30 Sep 2015 17:16:36 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0


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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