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DPM storage calculations   Leave a comment

I’m posting this as I couldn’t find a good single point of reference for how to calculate how much storage your DPM implementation might need.

First off; here are the formulas that DPM uses to calculate default storage space if you want to do the math yourself. Sometimes this is the fastest way if you only need a rough estimate for a simple workload. These don’t take data growth into consideration though.

If you need more complex calculations there are a couple of calculators for DPM:

As mentioned above none of these are for DPM 2012 but if all you need is an accurate estimate of how much storage a DPM implementation will use they’ll do just fine.

Something else worth mentioning is that they don’t take into consideration the new limits of Hyper-V in Windows Server 2012 but if you need to protect a cluster larger than 16 nodes you’d probably want to do the math on your own just to be sure anyhow. 🙂

The first calculator is the most detailed but only covers Exchange up to version 2007. I never use this my self.

The DPM Volume Sizing Tool is actually a set of scripts and Excel sheets that you use to gather actual data from your environment if you want to, along with a couple of Word documents on how to get the ball rolling.

The latest version of the stand alone calculators for DPM 2010 are more detailed than the DPM Volume Sizing Tool but the Exchange calculator is not as detailed as the older one for Exchange and DPM 2007. In addition, these only cover a few of the workloads that DPM can protect.

Personally I do the math myself and if I need to use a calculator I manually enter values into the Excel calculator from the DPM Volume Sizing Tool as this calculator both handles all workloads that DPM can protect and also gives me a good summary of the storage needed.

It’d be nice to see Microsoft develop a single Excel calculator for all workloads and DPM 2012 but that doesn’t seem likely so we’ll make do with what we got.

Posted 12 September, 2013 by martinnr5 in Documentation, Elsewhere, Technical, Tools

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