Here is an interesting article on The Register on a reprot Oracle has published about how to DIY your own cloud storage: Oracle reveals secret recipe for free DIY storage cloud ? The Register
There are 2 methods apparently:
1. Have lots of shiny Oracle kit to do it on or....
2. Using Apache and AjaXplorer
How to Build a Web-Based Storage Solution Using Oracle Solaris 11.1
Anyone care to give it a try?