Hi, All
According to my test, Nova cannot rebuild Volume-Booted instances, patch: 
https://review.openstack.org/#/c/176891/fixes rebuild for instances launched 
using image and attached with volumes, but yet rebuilding an instance booted 
from volumeis still not working.
The rebuild action for volume-booted instances after implementing the above 
patch performs like this:
The volumes are detached and attached again, the selected image/snapshot for 
rebuilding is actually useless.This means that if the /dev/vda for an instance 
booted from volume is broken for some reason, we cannot rebuild it from a 
newimage or the snapshot of this instance (nova just detach and attach again 
the same volume).
I don't know whether this is a bug or it is designed on purpose.
Thanks,
BR,Zheng                                          
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