How about when doing target data deduplication on the virtual tape library (VTL) or backup appliance

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Data deduplication information
CAS and data deduplication: Partners in archiving

In-band vs. out-of-band deduplication
It has a little bit different performance impact. The knock on target-based data deduplication is that you aren't really reducing the amount of data you are sending over the network. So you are still sending the full amount of data over the network every time you do a backup. You are reducing the amount of data that you store, but there is always going to be that performance hit with target-based deduplication.

Check out the entire Data Deduplication FAQ.

This was first published in December 2007

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