Amazon CTO Werner Vogels 写于 2006 年的博客文章。讨论了所谓的分布式系统的 scalability 到底为何物,以及为何很难做到 scalable。

"A service is said to be scalable if when we increase the resources in a system, it results in increased performance in a manner proportional to resources added. Increasing performance in general means serving more units of work, but it can also be to handle larger units of work, such as when datasets grow."