How is Xen different than Virtuozzo?
Virtuozzo virtualizes at the application level, while Xen modifies the operating system kernel to run as a VPS. Xen allows for much more flexibility including: • Memory cannot be oversold. The amount of memory on the hardware must equal the amount of memory divided for all VPSes on the node. • Each VPS can have its own kernel and kernel customizations. • Each VPS run a different kernel version (i.e. one kernel can run 2.4 while another can run 2.6) • Xen also supports hardware assisted virtualization, which allows to run unmodified operating systems like Microsoft Windows as a VPS instance.
