Re: [Qemu-devel] qcow2 snapshot + resize

[Eric Blake]

On 01/05/2016 05:10 AM, lihuiba wrote:

>>> In our production environment, we need to extend a qcow2 image with
>>> snapshots in it.

>> The thing is that one would need to update all the inactive L1 tables. I
>> don't think it should be too difficult, it's just that apparently so far
>> nobody ever had the need for this feature.

Is resizing a snapshot really what you want?  Ideally, a snapshot tracks
the data from a point in time, including the metadata of the size being
tracked at that time.  Extending the snapshots then reverting to that
snapshot means your guest would see a larger disk on revert than it did
at the time the snapshot was created, which guests might not handle very
well.

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

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