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.
本文从一实例出发，说明了服务器双机热备方案的问题及备份策略调整。
One example is taken in this article to explain the problem of double heat-computer backup on sever and the adjustment backup tactics.
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