code: def add_storage(self, storage=None, type='disk', address=None):
          
          self.cloud_manager.attach_storage(server=self.uuid,
                                            storage=storage.uuid,
                                            storage_type=type,
                                            address=address)
          storage.address = address
          storage.type = type
          self.storage_devices.append(storage)
docs: Attach the given storage to the Server.
  
          Default address is next available.