n the event that something happens to a Xen virtual machine (VM) that prevents you from starting it, it's a good practice to have the virtual machine storage back end mounted in the Linux file system of the Xen-based server. By doing so, you'll be able to repair the VM quickly and painlessly. In this tip, I'll cover how to do this for physical devices that are used as storage back ends.
Virtualization provides an escape from this very problem. The existing stack can continue to run as is as a guest inside a virtual machine, while the latest hypervisor happily supports the new hardware, as well as bringing benefits in reliability and perf
innotek VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.