Facebook Datacenter

Here I came across an article on Facebook data center:

http://scobleizer.com/2011/04/16/photo-tour-of-facebooks-new-datacenter/trackback/

I always get fascinated by the way big things are organized. So many small small units are brought together to form a giant structure, giant scheme. Facebook, holds enormous data, we all know that fact. But how does it store all the data, knowing that is big fun in its own way.