[Kolla-ansible][xena] how to deploy multiple cinder backends?

Hi, I want to deploy multiple cinder backends, ceph SSD pool for high performance VMS, ceph SAS pool for normal VMS and NFS share for small VMS and for cinder backup. Could that be done while deploying or it has to be done after the initial deployment? Could you assist me with some examples, sometimes the documentation is not that obvious to understand. Regards.