也许它正在执行某种级别的工作，而只是在出现故障事件时帮助启动恢复？
Perhaps it's performing some level of work, but only to help prime a recovery in the event of a failure?
在必要时，您必须确保每一层可以随着用户负载的增加而按一定的比例增长，并且每一层允许在故障转移时继续可用。
You must ensure that each layer can scale as user load increases, and that each layer allows for continuous availability with failover, if necessary.
当一个数据库服务器的速度降低时，为进行测试和排除故障而增加的工作负载很可能使问题变得更严重。
When a database server slows down, the added workload from people logging in to test and troubleshoot can easily make matters worse.
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