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Does anyone know of a resource showing me some parameters for estimating how far different managed servers reach? How many concurrent users, bandwidth, etc.? Have a hard time getting a mapping for expected concurrent users -> hardware requirements. How quickly can you adjust the HW resources in a non-cloud setup if your startup product is more successful than expected?

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Impossible question, it depends what your app does and what your users do. Even within the same company, 1000 concurrent users of Google Maps will use completely different resources than 1000 concurrent users of gmail. It'll even change over time for the same app and same users, as their behaviour or the world around them changes.

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