[Rdo-list] Cinder multi-backend (NetApp)

HI list 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/environme... <https://github.com/openstack/tripleo-heat-templates/blob/master/environme... , but hot to enable dual backends?)