how would you go about implementing multi backends in cinder via tripleo-templates? I know that upstream puppet modules supports it, but how to specify a second backend (in particular, a NetApp+Ceph deployment)? Any hint appreciated.

P.S.

I did find https://github.com/openstack/tripleo-heat-templates/blob/master/environments/cinder-netapp-config.yaml , but hot to enable dual backends?)