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multi-backend mode is used for the same cinder-volume service. Multi cinder-volume configuration is not different with the only one. You just need to deploy cinder service on the second node and change the cinder.conf rightly. cinder controller and one cinder-volume service on one node. And the other one just run cinder-volume service. The cinder.conf of the node which is running cinder-volume only need the same queue and DB as the cinder controller node. You can try it. It's not complicated.