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Allocate memory 1:1 for best performance, for vCPU's the default is 16, I would suggest 6 or changing the default. How do you plan on running VMS on an x86 platform ? do you have an emulator ? I would assume so. for your DB instance I would start with what you have, and then you can grow the vCPU's if you need to later, or OpenStack calls it re-sizing a flavor.