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On 11/22/2019 8:05 AM, Alexandre Arents wrote:
>   C) Change create_image()/imagebackend driver behavior,
>      to create a flatten qcow2 file in case of unshelving.
>      flattening disk may be a solution because there will be no more "orphan backing file".
>      (Basicly doing like "flat" backend driver except we need to stay in qcow2 instead of RAW)
>          PROS:
>           -we keep orignal unshelve behavior/assumption
>          CONS:
>           -It means that in your infra configured in COW some instances will be in "qcow2 flat",
>            Flat qcow2 instance works great (livemigration/resize..). Would all installation ok with that ?
>            Ok it seems a little odd to ask COW driver to not do COW in some case. Alternatilevy we can
>            force using flat driver if unshelving, but we need to change flat driver to support also qcow2.
>   D) During spawn() if unshelving we convert "qcow2 disk with backing file" to a "flatten qcow2 disk",
>      just after self._create_image().
>      It looks more like a workaround than a long term solution as it need to convert something created before,
>      that do not meet the need(better to do C).

Does this already fix your problem?

https://review.opendev.org/#/q/If3c9d1de3ce0fe394405bd1e1f0fa08ce2baeda8

-- 

Thanks,

Matt