The "DCN Configuration and Operation" document should have an appendix consisting of known working sample YAML files to have director deploy a DCN deployment. This should include an example of a way to deploy the storage on the edge as tracked in BZ 1802772. An example appendix where this has been done in other documentation is at: https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html-single/network_functions_virtualization_planning_and_configuration_guide/index#appe-sample-ovsdpdk-sriov-files
Until we have a vehicle to deliver this content and a commitment to maintain it we won't be able to provided such an example.