My understanding is that this is primarily which numbers you want to look good. Disable zero detect and the dedupe ratio will increase, enable zero detect and general compaction/thin ratio will increase.
Without zero detect, you will store a 16kB block with all zeros in th DDS, with zero detect on all volumes you don’t. To my knowledge no other AFAs support zero detect and will dedupe zero blocks to increase dedupe ratio and 3PAR does the same by default.
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