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Update ch1.md #190

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### 软件错误

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）。
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。虽然大量硬件组件之间可能存在微弱的相关性（例如服务器机架的温度等共同的原因），但同时发生故障也是极为罕见的。

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**【5】。例子包括：

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| 上一章 | 目录 | 下一章 |
| ----------------------------------- | ------------------------------- | ------------------------------------ |
| [第一部分：数据系统基础](part-i.md) | [设计数据密集型应用](README.md) | [第二章：数据模型与查询语言](ch2.md) |
| [第一部分：数据系统基础](part-i.md) | [设计数据密集型应用](README.md) | [第二章：数据模型与查询语言](ch2.md) |