12）副本管理服务（ReplicaManagementService，RMS）：以RC和RLI作为其核心，维 护关于逻辑文件标识符所在物理位置的信息，并提供对这些信自、的访问，如...
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虽然你的个人电脑只能保存一个文件的一个副本，但像 Facebook 这样的大型服务项目，则会依赖于所谓的内容分发网络来管理数据和分发。
While your personal computer only keeps one copy of a file, large-scale services like Facebook rely on what are called content delivery networks to manage data and distribution.
当您进行备份后，将其副本放到一个高度可用的文件系统中；否则，部署管理器服务器出现磁盘故障会使这些备份变得不可用。
When you have the backup, place a copy of it in a highly available file system; otherwise, a disk outage on your deployment manager server could make the backups unavailable to you.
动态布置是一种功能，xd自主管理器使用该功能决定一个集群内放置多少应用程序服务器副本比较合适。
Dynamic placement is a facility in which the XD autonomic managers determine how many copies of an application server are appropriate within a cluster.
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