可以在您方便的时候运行备用服务器，确保流程的这个部分符合期望。
You can run the alternate server at your convenience to make sure this part of the process works as expected.
这个工具在大部分时间里都隐藏了起来，但是在上述危机情况下，是时候对这个工具拂尘备用了。
This box should remain in storage most of the time, but for crises such as this, a dusting-off is in order.
大部分支持VIP的交换机也能支持主用系统或备用系统的策略，以便流量跑到主用系统那里，除非它不可用或验证失败。
Most switches that support a VIP can also support a policy of primary system or secondary system, so that traffic goes to the primary system unless it is unavailable or fails the validation.
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