The magic that makes Google tick

• Over four billion Web pages, each an average of 10KB, all fully indexed.
• Up to 2,000 PCs in a cluster.
• Over 30 clusters.
• 104 interface languages including Klingon and Tagalog.
• One petabyte of data in a cluster -- so much that hard disk error rates of 10-15 begin to be a real issue.
• Sustained transfer rates of 2Gbps in a cluster.
• An expectation that two machines will fail every day in each of the larger clusters.
• No complete system failure since February 2000.
• fully managed system (we're not counting distributed computing projects here), some 200 computer science PhDs, and 600 other computer scientists.

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