Beware of Oracle deployments on anything other than Oracle Virtual technology
Before anyone thinks about Oracle technology on a virtual environment please take a look a metalink notes from Oracle such as 249212.1 regarding VMWare. Make sure you understand the difference between 'certified' and 'supported'. You should quite rightly be nervous about putting a 'production' instance on a non-certified configuration. If the support issue doesn't worry you, the way they licence their technology will, and it will tell you all you need to know about what Oracle thinks about customers using non-Oracle technology in the stack. In other words, they discourage you from using anything other than Oracle or Sun Hypervisors.