Architectures such as x86-64 / IA-64 are basically monitored on the same hardware by a virtual machine known as Xen. It started from University of Cambridge and was to be used in the year 2003. These are used mainly on Large Servers and for virtual private servers. It also increases the ability to utilize / initiate a virtual machine. This also eased out the reboot capabilities. These can also be easily subjected to OS updates.

Downtime possibility is also reduced considerably. Running Multiple OS is common with Xen. In any situation, host are not compromised.

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