Unlike shared hosting which uses a single file system shared by all users, a VPS, like a dedicated server, resides in a private environment with its own independent operating system, web server, mail server, and software instances.

The benefits of VPS Hosting are many:

• You have root access to the server
• Install any application you want, ROR, PHP, Subversion,Tomcat...
• Have just about any flavour of Centos, Fedora, Debian...
• Guaranteed uptime with most suppliers

What is Xen?

Xen is an open source virtual machine monitor, developed by the University of Cambridge and now XenSource. It is intended to run up to 100 full featured OSs on a single computer. Operating systems must be explicitly modified ("ported") to run on Xen (although compatibility is maintained for user applications). This enables Xen to achieve high performance virtualization without special hardware support.

• Xen compared against other Technologies