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Update 如何设计一个高可用系统？要考虑哪些地方？.md
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‎docs/system-design/website-architecture/如何设计一个高可用系统？要考虑哪些地方？.md‎

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**一般情况下，我们使用多少个 9 来评判一个系统的可用性，比如 99.9999% 就是代表该系统在所有的运行时间中只有 0.0001% 的时间是不可用的，这样的系统就是非常非常高可用的了！当然，也会有系统如果可用性不太好的话，可能连 9 都上不了。**
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除此之外，系统的可用性还可以用某功能的失败次数与总的请求次数之比来衡量，比如对网站请求 1000 次，其中有 10 次请求失败，那么可用性就是 99%。
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## 哪些情况会导致系统不可用？
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1. 黑客攻击；

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