Google From Beginning - The First Google Rack
The first Google rack appeared in the distant 1999.
Use cheap and easily replaceable equipment, which is inexpensive and allowed to appear this wonderful company to light.
Each rack rate includes a pair of motherboards, mostly cheap board, which in case of breakdowns simply replaced by new ones.
Some motherboards have not been in operation due to the design of fault-tolerant system.
Now this rack stands in the Computer History Museum (Computer History Museum).
Original article: http://www.flickr.com/photos/jurvetson/157722937/