Open Stack

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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