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Originally Posted by zagi
Sure, why would you segment a server when you can run all the applications under a regular non-virtualized OS.
I think virtualizing would only create more overhead and hence reduce performance, where is the benefit?
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Independence and isolation for the application primarily. You can better control the resources each application gets this way (by dedicating a virtual server to each one). If that application fails, it won't take the whole box with it.
Having said that, overhead is not much of an issue with us (3% for Linux, 5% for 2k3-mostly to memory). So the hardware performance is not affected.