在设置任何高可用性环境时，都需要考虑这一点，在这种环境中，每个服务器互为备用，但是它们必须维持自己的服务水平。

This is something that you need to consider when setting up any highly-available environment where each server backs the other up, but also has its own service level it has to adhere to.

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云计算将可移植设备与强大的服务器互为补充，它需要一个能够让服务器架构师和程序员最大程度利用小型客户机机器的操作系统。

Cloud computing, where portable devices complement powerful servers, requires an operating system that maximizes what the server architects and programmers can do on a small client machine.

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