My proposal is to setup all attributes for drbd resources in ha_storage.rb recipes for database and rabbitmq, as I did it in
https://github.com/vuntz/barclamp-database/pull/2

  if node["drbd"]["rsc"][drbd_resource].nil?
    node["drbd"]["rsc"][drbd_resource] = {
      "port" => drbd_port,
      "disk" => drbd_disk,
      "device" => fs_params["device"],
      "fs_type" => fs_params["fstype"],
      "configured" => false
    }