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Myths and Mysteries About DPM Deduplication

Written By: langdon on September 28, 2013 No Comment

Myths and Mysteries about DPM Deduplication

A Google search for “DPM deduplication” tells us a lot about the “disinformation” surrounding the topic. Among the more popular threads are the following:

“DPM already has deduplication because it runs on Server 2008 or 2012 that includes native deduplication.”

The short answer is: No, it does not. “Windows Storage Server 2008 enhances the deduplication capabilities of its predecessor, using SIS-based data deduplication for the Windows File Services, which eliminates identical files on volumes. The duplicates are replaced by pointers that link to files placed in the SIS Common Store. Obviously, for this to work on the backup side, you need to have a SIS-aware backup. And that’s where Microsoft’s System Center Data Protection Manager comes into play. Some people mistakenly believe System Center’s Data Protection Manager (DPM) to have deduplication capabilities. That’s not true. DPM may use components that are dedupe-like (for example, block-level change tracking), and DPM certainly does an excellent job of using small amounts of storage to fit a large amount of data or a large number of recovery points (giving the impression that traditional SIS or deduplication must be involved). But DPM does not use the traditional compression, SIS, or deduplication features natively.

The fact is that DPM can protect data that has been deduplicated by Windows, but the deduplicated data being protected is returned to its non-deduplicated state when stored by DPM.


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