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fix: ch1 request #166

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Jan 1, 2022
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fix: ch1 request #166

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2 changes: 1 addition & 1 deletion ch1.md
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我们通常认为硬件故障是随机的、相互独立的：一台机器的磁盘失效并不意味着另一台机器的磁盘也会失效。大量硬件组件不可能同时发生故障，除非它们存在比较弱的相关性（同样的原因导致关联性错误，例如服务器机架的温度）。

另一类错误是内部的**系统性错误（systematic error）**【7】。这类错误难以预料，而且因为是跨节点相关的，所以比起不相关的硬件故障往往可能造成更多的**系统失效**【5】。例子包括：
另一类错误是内部的**系统性错误（systematic error）**【8】。这类错误难以预料，而且因为是跨节点相关的，所以比起不相关的硬件故障往往可能造成更多的**系统失效**【9】。例子包括：

* 接受特定的错误输入，便导致所有应用服务器实例崩溃的BUG。例如2012年6月30日的闰秒，由于Linux内核中的一个错误，许多应用同时挂掉了。
* 失控进程会用尽一些共享资源，包括CPU时间、内存、磁盘空间或网络带宽。
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