From a business perspective, there are many reasons for using virtualization. Most come down to what's called server consolidation. Simply put, if you can virtualize a number of under-utilized systems on a single server, there are distinct savings in power, space, cooling, and administration due to having fewer servers. Because it can be difficult to determine server utilization, virtualization technologies support what's called live migration. Live migration allows an operating system and its applications to be migrated to a new server to balance the load over the available hardware.

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