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3. Capacity Planning > Do the Math . . .

Do the Math . . .

When you evaluate a potential architecture, the most critical part of the job is to compare your required latency and bandwidth to the rated capacity of every link in your proposed configuration. Each component should meet those requirements with an additional margin for component interaction inefficiencies and increasing load over the life of the architecture. You could skip the calculations and forecasting, buy something that satisfies your immediate requirements, and forge ahead, planning to upgrade when necessary — but there are a few reasons why you’re well advised to do a little math and think about where you want the system to go in the future.

First of all, management likes to have a good idea of what they’re going to get for the money you’re spending. If you spend money on a system that cannot deliver because you didn’t do a few calculations, you then have the embarrassing task of explaining why you need to spend more. You may not even be able to use what you have already bought if it’s not compatible with the higher-performance equipment you need.


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