Quick look on production data-center
How looks a computer data-center nowadays? Lets go to one of them and take a look.
Rows of server racks
Big 4U backup servers mounted in a rack
Switch and cables…cables…cables 
A rack from the back side
Again back of servers and hundreds of cables
More production machines mounted sparsely in a rack
A lot of web servers!
And even more web servers 
Huge air condition unites installed for cooling… you can never have summer here!
The photos can be found in photo gallery.