docs: def _get_array_controller_resource(self):
          """Gets the ArrayController resource if exists.
  
          :raises: IloCommandNotSupportedError if the resource ArrayController
              doesn't exist.
          :returns the tuple of SmartStorage URI, Headers and settings.
          """
          headers, storage_uri, storage_settings = self._get_storage_resource()
          if ('links' in storage_settings and
                  'ArrayControllers' in storage_settings['links']):
              # Get the ArrayCOntrollers URI and Settings
              array_uri = storage_settings['links']['ArrayControllers']['href']
              status, headers, array_settings = self._rest_get(array_uri)
  
              if status >= 300:
                  msg = self._get_extended_error(array_settings)
                  raise exception.IloError(msg)
  
              return headers, array_uri, array_settings
          else:
              msg = ('"links/ArrayControllers" section in SmartStorage'
                     ' does not exist')
              raise exception.IloCommandNotSupportedError(msg)