元数据服务器管理数据位置，以及在何处存储新数据。
The metadata servers manage the location of data and also where to store new data.
当存储资源离线或断开与其管理服务器的连接时就会发生可用性丧失。
Loss of availability - a loss of availability occurs when storage resources go offline or are disconnected from their managing servers.
在电话中使用服务——讲解电话如何存储和操纵数据，管理激活和服务器进行同步？
Using Services on the phone - how the phone stores and manipulates data, manages activation and synchronizes with the server.
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