The use of system virtualization offers many benefits to IT organizations and to end-users. One of the key benefits is more efficient resource utilization. In order to guarantee that sufficient resources are available to every user and application to satisfy business demands and service level agreements, IT organizations have overprovisioned systems, increasing capital and operating expenditures offering better operational flexibility. With virtualization, capacity can be used more effectively, reducing the costs to acquire systems, energy savings, the environmental (power cooling and real estate) costs required to run them, and the staff costs associated with managing the additional systems.