如果活动aws实例失败了，您可以启动一个新实例并重用现有的EBS存储恢复服务器。
If your live AWS instance fails, you can start a new instance and reuse the existing EBS storage to restore your server.
例如，可能必须修改服务器上运行的脚本以使用灾难恢复存储设施。
For example, you may have to modify the scripts that run on them to use the disaster recovery storage facilities.
这个日志对故障恢复也很有用：如果元数据服务器发生故障，它的日志就会被重放，保证元数据安全存储在磁盘上。
The journal is also useful for failure recovery: if the metadata server fails, its journal can be replayed to ensure that metadata is safely stored on disk.
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