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James Hamilton is one of the smartest and most accomplished engineers I know. He now leads Microsoft's Data Center Futures Team, and has been pushing the opportunities in data center efficiency and internet scale services both inside & outside Microsoft. His most recent post explores misconceptions about the Cost of Power in Large-Scale Data Centers:
I’m not sure how many times I’ve read or been told that power is the number one cost in a modern mega-data center, but it has been a frequent refrain. And, like many stories that get told and retold, there is an element of truth to the it. Power is absolutely the fastest growing operational costs of a high-scale service. Except for server hardware costs, power and costs functionally related to power usually do dominate.
However, it turns out that power alone itself isn’t anywhere close to the most significant a cost. Let’s look at this more deeply. If you amortize power distribution and cooling systems infrastructure over 15 years and amortize server costs over 3 years, you can get a fair comparative picture of how server costs compare to infrastructure (power distribution and cooling). But how to compare the capital costs of server, and power and cooling infrastructure with that monthly bill for power?
The approach I took is to convert everything into a monthly charge. [...]
cloud computing, energy, microsoft, operations, performance, platforms, James Hamilton, utilities, utility computing, velocity, velocity09, web2.0
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翻译：xiaochong
James Hamilton是我知道的最聪明最牛的工程师之一。他现在领导微软Data Center Futures团队，一直在微软内部和外部推动数据中心效率和互联网规模服务的各种机遇。下面是他最新的文章，指出了人们关于大规模数据中心电力成本方面的一些误解：
我无数次听到大家讲在现代化大型数据中心中电力成本是最大的一部分成本。事实未必如此。电力成本无疑是增长最快的运营成本。除了服务器硬件成本之外电力成本以及电力相关成本通常是最大的一块。
然而实际上电力单独一部分的成本并不是总成本中最大的。让我们来看一下。将配电系统和制冷系统这些基础设施的成本分摊到15年中，将服务器成本分摊至3年中，这样就可以很好地比较服务器成本和基础设施（配电和制冷）成本了。但是如何比较服务器、电力以及制冷基础设施的资本成本和每月电费的关系？
我的办法是把一切都分摊到每个月中。
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Jesse Robbins
2008-11-29
Discussion
一直以为电费是最大的开销。Google的数据中心应该如此。