My understanding of the purpose of virtualization is to reduce server sprawl. In theory if you get one physical server to do the work of two servers you increase the percent of utilization of the server while cutting down on the number of servers in the pool, thus reducing power consumption, cooling needs, data center space, hardware and software costs.
But if you then utilize automated failover that requires that you have a powered-on stand by server that takes up space, needs to be cooled, does nothing until the primary server fails, doubles the hardware cost, and possible doubles the software costs, doesn’t this defeat the purpose of virtualization?
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