Re: [Qemu-devel] qcow2 snapshot + resize

[Eric Blake <eblake@redhat.com>]

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On 01/06/2016 09:20 AM, Max Reitz wrote:

>> If I take a snapshot while the guest sees a 1G disk, then resize the
>> disk to 2G, then roll back to the point in time of the snapshot, I'd
>> expect the disk to roll back to 1G in size.  Anything else is likely to
>> confuse the guest.  And that's what current resize support already does
>> (it only resizes the active image, not the snapshots).
> 
> No, the current resize operation just refuses to resize the image if it
> has any snapshots. Snapshots currently do not store the size of the
> image when they were created.

Huh? I thought that we specifically added bytes 48-55 per snapshot entry
in the qcow2v3 description specifically so that internal snapshots DO
record the size of the image when the snapshot was created.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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