Hyper-V复制的组件包括一台主服务器（primary server）和复制服务器(replica server),主服务器上跑生产环境中的虚拟机，备份服务器上保留主服务器上虚拟机的副本。
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content replica server 容快取伺服器
It is advisable to execute this change during announced system downtime, unless you have the replica server running to take care of the unavailability of the server being upgraded.
建议在公告的系统停机时间执行这一修改，除非正在运行副本服务器，可以应对在升级期间服务器不可用的问题。
It also insures that the information is up-to-date for all users of the server replica.
它还保证了信息对服务器副本的所有用户来说都是最新的。
If the user is in a local replica, but has connectivity to the server, you must find the server replica so that you can use the agent and parameter document in that replica.
如果用户在使用本地副本，但是还没有连接到服务器，您必须找到该服务器副本，才能使用该副本中的代理和参数文档。
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