if sys.LDAPConfig.Enabled() {
		sys.SetUsersSysType(LDAPUsersSysType)
	}

	if etcdClient == nil {
		var group *singleflight.Group
		if env.Get("_MINIO_IAM_SINGLE_FLIGHT", config.EnableOn) == config.EnableOn {
			group = &singleflight.Group{}
		}
		sys.store = &IAMStoreSys{
			IAMStorageAPI: newIAMObjectStore(objAPI, sys.usersSysType),
			group:         group,
		}