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Citrix XenApp Sizing Part 2 – Determining Farm Capacity

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As we have seen in part 1 of this series, when sizing a new farm the first thing we need to know is the capacity of the existing farm. Armed with data on capacity and additionally load, we can easily calculate the capacity of a new farm. In this article I describe how to determine capacity of the four relevant hardware components of a XenApp server: CPU, memory, storage and network.

CPU Capacity

If you only have one CPU model, determining the total CPU capacity is simple: just add up the total number of cores. But what if you have different models? How do you add the performance of, say, a Xeon 7100 and a Xeon E5640? Simply adding Gigahertz values does not cut it; modern CPUs are more efficient per Herz than older ones.

Normalization

You can add numbers from two different systems only after you normalize them, i.e. make them comparable. One method of making CPUs comparable is to run benchmarks. I did not want to do that, though. Way too cumbersome. There had to be a more elegant solution. And there is.

To learn more and to read the entire article at its source, please refer to the following page, XenApp Sizing Part 2 – Determining Farm Capacity- Helge Klein – Blog

  

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