As more organizations move to disk-based backup with dedupe, the glaring absence of high availability (HA) in many of today’s offerings is becoming apparent.
Data deduplication is a hot technology, since it can really help to reduce overall backup costs by storing months or years worth of backup data very efficiently on disk. (Greg Shulz delivered a fairly good presentation in April 2007 at Storage Networking World (SNW) that goes over trends in storage and how dedupe is part of that trend (PDF), and another article here about demystifying data deduplicaiton.)
If the dedupe solution breaks though, what happens to the months of data stored behind it on disk? Since data deduplication solutions can store a lot of data, you can end up with a lot of eggs (backups in this case) in a one basket. It's obvious that RAID protection alone is not enough when you store multiple backups on non-removable media that can fail.
With non-HA dedupe solutions, if the solution fails, there are no tapes to go back to recover. This is why having tapes around is still a good thing (especially for long term archives) and why high availability clustering is a must for dedupe.
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Source: computerworld.com
By: Chris Poelker
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