What is the best method for virtual environment capacity planning?
AppDevGuy 2 years ago
The shared infrastucture of a virtual environment makes it a lot harder for me to plan capacity for than it is with a traditional server environment. The idea of virtualization is to efficiently use all of your resources, and this central concept is defeated if resources are unbalanced on a host. Too little physical memory causes VMs to start making up for it by switching to disks, then performance goes down the tubes. I've tried to look at resource trends historically to try to determine the balance point, while maintaining sufficient spare resource capacity to handle VMs when host failures occur. Basically, I feel like I am back in statistics class scratching my head and not only not knowing the answer, but being confused on how to get there. It gets complicated when I start trying to account for spare capacity as I plan capacity that meets future growth needs. In the end, I still feel like I am just making a slightly educated guess. Have suggestions for any useful tools that can help make capacity planning more meaningful than my current manual process?
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