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Re: [Qemu-devel] [PATCH 8/8] docs: add mirroring to live block operation


From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 8/8] docs: add mirroring to live block operations
Date: Fri, 13 Apr 2012 12:05:17 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:11.0) Gecko/20120329 Thunderbird/11.0.1

On 04/13/2012 11:32 AM, Paolo Bonzini wrote:
> Il 13/04/2012 19:09, Eric Blake ha scritto:
>>>> +It is also possible to use raw as the format of the destination image.
>>>> +Converting an image to raw will properly support thin provisioning.
>> Do you need to mention the use of block_job_cancel needed at the point
>> where you are ready to stop qemu from writing into the copy?
> 
> No, you need to do this with drive-reopen.  Using block_job_cancel will
> report completion, but will leave a race window that can cause to
> corruption in the guest.  Do your libvirt patches do that? O:)

They don't in v4 [1], but I'll fix it to do that in v5.  Thanks for the
heads up.
[1] https://www.redhat.com/archives/libvir-list/2012-April/msg00330.html

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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