如果没有在峰值负载下积极测试和验证集群，那么在真正发生故障时，故障转移的一端可能受到资源限制，响应时间较长，甚至出现故障。
If you do not actively test and validate your clustering during peak loads, during an actual failure the failover side can become constrained and deliver poor response times or even fail.
只要满足了非功能性需求(负载能力、平均响应时间、峰值响应时间等)，应用程序就可以部署，用户也会觉得满意。
Once the non-functional requirements of a system (load capacity, average response time, peak-load response time, and so on) have been met the application can be deployed and the customer is satisfied.
如果IT部门购买、构建和维护集群，以处理峰值负载，这个做法成本高昂、耗费时间、浪费严重。
When IT departments buy, build, and maintain clusters to handle peak loads it can be expensive, time consuming, and wasteful.
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