docs: def _parse_raid_config_data(self, raid_config):
          """It will parse raid config data based on raid controllers
  
          :param raid_config: A dictionary containing target raid configuration
                              data. This data stucture should be as follows:
                              raid_config = {'logical_disks': [{'raid_level': 1,
                              'size_gb': 100, 'controller':
                              'HPE Smart Array P408i-a SR Gen10'},
                              <info-for-logical-disk-2>]}
          :returns: A dictionary of controllers, each containing list of
                    their respected logical drives.
          """
          default = (
              self.smart_storage.array_controllers.get_default_controller.model)
          controllers = {default: []}
          for ld in raid_config['logical_disks']:
              if 'controller' not in ld.keys():
                  controllers[default].append(ld)
              else:
                  ctrl = ld['controller']
                  if ctrl not in controllers:
                      controllers[ctrl] = []
                  controllers[ctrl].append(ld)
          return controllers