for testing purposes. Running multiple copies of ONE kernel is the way to go. When you use multiple different OSes on a single box, you have to have the OS image, and all of the application images loaded in memory for EACH instance. The best approach is to let the OS offer virtual copies of the same OS. With that, you get ONLY one image for the OS and all of the applications. On a server farm, each server should be dedicated to a particular OS. This is part of why RedHat is moving to KVM.
Virtualization done RIGHT is a great tool.
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