How does Google manage its knowledge?

To deal with the more than 10 billion Web pages and tens of terabytes of information on Google's servers, the company combines cheap machines with plenty of redundancy, the author of this article Hoelzle said. Its commodity servers cost around $1,000 apiece, and Google's architecture places them into interconnected nodes. more from http://www.internetnews.com/xSP/article.php/3487041