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Many vendors claim a 4:1 or 5:1 data reduction ratio for their systems -- based on typical use. I think that's primarily because of the type of environments they've gone in to. For example, databases have a lot of redundant data, and as such, are very conducive to data reduction.
If you are using an array for general purpose storage for a variety of types of data, not just databases, you're likely to see somewhere in the neighborhood of 3:1 data reduction. So, if I was planning, I would plan for 3:1 even if the vendor says they're able to get 5:1.
That 3:1 ratio is a very conservative number, and typically the people who use the systems are very conservative. And so, that's a practical number work with. Many vendors offer an absolute guarantee of at least 2:1. So that's great, take advantage of it.
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