title: Store large amount of images on multiple servers
body: <p>I would like to know what is the best solution for storing large amount of images on multiple servers like google, facebook.</p>
  
  <p>It seems that storing in filesystem is better then inside a database but what about using a noSQL DB like cassandra.</p>
  
  <p>Do Google/Facebooke store the same image in multiple servers for the load balancing.
  How does it work? What is the best solution?</p>
  
  <p>Thx a lot</p>