Paravirtualization is a technique in which a software interface that is similar but not identical to the underlying hardware is presented.

泛虚拟化是这样一种技术，软件接口以与底层硬件相似但并不完全一致的方式得以呈现。

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To make a long story short, redundancy in systems design is a common technique to increase availability at the cost of additional hardware (and software).

简言之，在系统设计中冗余是提高可用性一个常用技术，代价是增加额外硬件(和软件)。

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I hope you will try this technique for setting up a very highly available Web server using inexpensive hardware and readily available software.

我希望您尝试使用该技术，用廉价的硬件和立即可用的软件建立一个可用性非常高的Web服务器。

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