Back Up Cluster Metadata备份群集元数据

This procedure shuts down the mongod instance of a config server in order to create a backup of a :sharded cluster's metadata. 此过程关闭config服务器的mongod实例，以便创建：分片集群元数据的备份。The cluster's config servers store all of the cluster's metadata, most importantly the mapping from chunks to shards.集群的配置服务器存储集群的所有元数据，最重要的是从块到分片的映射。

When you perform this procedure, the cluster remains operational [1].执行此过程时，群集将保持可操作状态[1]。

1. Disable the cluster balancer process temporarily. 暂时禁用群集平衡器进程。See Disable the Balancer for more information.有关详细信息，请参阅禁用平衡器。
2. Shut down one of the config databases.关闭其中一个配置数据库。
3. Create a full copy of the data files (i.e. the path specified by the dbPath option for the config instance.)创建数据文件的完整副本（即配置实例的dbPath选项指定的路径）
4. Restart the original configuration server.重新启动原始配置服务器。
5. Re-enable the balancer to allow the cluster to resume normal balancing operations. 重新启用平衡器以允许群集恢复正常的平衡操作。See the Disable the Balancer section for more information on managing the balancer process.有关管理平衡器进程的更多信息，请参阅禁用平衡器部分。