Virtualized systems are attracting attention as a technology that makes the most of excess system resources. For example, with the current one-server, one-application paradigm, most servers consistently have excess resources. Specifically, except for times of server job congestion, usually only 5% to 7% of resources are used. Virtualized systems are a way to solve this issue.

Virtualized systems also have the following advantages:

• Operating systems and devices can be shared and centrally managed.
• Several old servers can be made into a virtual server, and run as one new server.
• The number of servers can be reduced, cutting electricity and air conditioning costs.