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Hi,all:
        I have a spec which is support volume backed server rebuild[0].This spec was accepted in Stein, but some of the work did not finish, so repropose it for Victoria.  I sincerely wish this spec will approved in Victoria, so I make an exception for this, and the Nova team will approved this if the cinder reimage question is solved this week[1].  This spec is depend on the cinder reimage api [2], and the reimage api has a question. We just need to know if cinder are ok with the change in polling to event like the volume extend. More clearly, Cinder reimage should add a new 'volume-reimage' external event like the volume extend, so that nova can wait for cinder to complete the reimage[3].
       The Cinder code is[4], if you have some ideas, you can comments on it.Thank you very much!





Ref:

[0]:https://blueprints.launchpad.net/nova/+spec/volume-backed-server-rebuild

[1]:http://eavesdrop.openstack.org/irclogs/%23openstack-meeting-3/%23openstack-meeting-3.2020-08-06.log.html#t2020-08-06T16:18:22-2
[2]:https://blueprints.launchpad.net/cinder/+spec/add-volume-re-image-api
[3]:https://review.opendev.org/#/c/454287/
[4]:https://review.opendev.org/#/c/606346/
Best Regards
Rambo
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