在主实例不可用的情况下，流量管理器也可用作灾备系统。

The Traffic Manager can also be used in a failover system in case the primary instance isn’t available.

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XX工程灾备系统由五部分组成：用户界面子系统、状态分析子系统、策略管理子系统、接管互助子系统、数据倒回子系统。

User Interface Subsystem, State Analyze Subsystem, Policy Manage Subsystem, Take-over and Concur Subsystem, Data Recovery Subsystem are composed the Disaster Tolerance system of XX project.

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