code: def post(method, hmc, uri, uri_parms, body, logon_required,
               wait_for_completion):
          
          assert wait_for_completion is True  # async not supported yet
          check_required_fields(method, uri, body, ['name', 'cpc-uri', 'type'])
          cpc_uri = body['cpc-uri']
          try:
              cpc = hmc.lookup_by_uri(cpc_uri)
          except KeyError:
              raise InvalidResourceError(method, uri)
          if not cpc.dpm_enabled:
              raise CpcNotInDpmError(method, uri, cpc)
          check_valid_cpc_status(method, uri, cpc)
  
          # Reflect the result of creating the storage group
  
          body2 = body.copy()
          sv_requests = body2.pop('storage-volumes', None)
          new_storage_group = hmc.consoles.console.storage_groups.add(body2)
  
          sv_uris = []
          if sv_requests:
              for sv_req in sv_requests:
                  check_required_fields(method, uri, sv_req, ['operation'])
                  operation = sv_req['operation']
                  if operation == 'create':
                      sv_props = sv_req.copy()
                      del sv_props['operation']
                      if 'element-uri' in sv_props:
                          raise BadRequestError(
                              method, uri, 7,
                              "The 'element-uri' field in storage-volumes is "
                              "invalid for the create operation")
                      sv_uri = new_storage_group.storage_volumes.add(sv_props)
                      sv_uris.append(sv_uri)
                  else:
                      raise BadRequestError(
                          method, uri, 5,
                          "Invalid value for storage-volumes 'operation' "
                          "field: %s" % operation)
  
          return {
              'object-uri': new_storage_group.uri,
              'element-uris': sv_uris,
          }
docs: Operation: Create Storage Group.