It is all too common for systems to be built based on assumptions regarding availability, leading inevitably either to inappropriate expense, or applications that perform worse than desired.
很普遍的做法是系统构建在假定的可用性上面，这不可避免地导致不合适的花费或应用程序工作得比预期的要差。
Based on the above table and the desired high availability of 99.99%, the allowed downtime for the various causes are shown in table 3.
基于上述表格以及期望的99.99%的高可用性，各个原因的可允许停机时间如表3所示。
The appropriate choice for your environment will depend on your existing application inventory, as well as resource staffing availability within your desired implementation timeframe.
具体哪个选择适合您环境，应该由现有应用程序组成情况以及所需的实现时间内资源配备的可用情况决定。
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