How Google does it . . .

From today's NY Times:

"Nobody builds servers as unreliably as we do," Mr. Hölzle said in a speech last year at CERN, the Swiss particle physics institute. Google is reducing cost while maintaining performance by shifting the burden of reliability from hardware to software ? individual hardware components can fail, but software automatically shifts the local task and the data to other machines.

For example, Google designed a software system it calls the Google File System that keeps copies of data in several places so Google does not have to worry when one of its cheap servers fails. This approach also means that it does not have to make regular backup copies of its data as other companies do.

. . .

While Google's servers are built on inexpensive parts, the designs it uses have been modified every year or so, to improve their efficiency and increasingly to customize them to Google's applications. The current generation uses the powerful Opteron chip from Advanced Micro Devices, which uses less power than the Intel chips Google had used.

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