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Yep, attempting to plan capacity manually can be frustrating. There are a number of tools out there that can help you, but they have one obvious downside; up front cost. You will probably need to be able to use the ROI to justify the expense if you are not the one that signs the check, but as you clearly recognize, inaccurate capacity planning can create bottleneck and have a negative functional impact in a virtual environment. There are two sources of virtualization managers that I can think off off the top of my head that might be able to help - OpTier and SolarWinds. I am more familiar with OpTier BTM, which is very good, but they are really focused on large business focused in areas like telecommunications, production, finance and the like. SolarWinds offers a virtualization manager that can automate the process and could possibly meet your needs, but I haven't personally used it. Whatever product you decide on, an automated process will be a lot easier and probably more accurate than your manual attempts at capacity planning, unless you happen to be very good at it and spend a lot of time to get it done right.