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A comment on ZFS Deduplication. Parent comment

Re:ZFS Deduplication by bensummers on Monday November 02, 2009 @01:23PM (#917445)
It's not a useful measure because it's not the same thing at all. Dedup only works if the block is aligned to a ZFS block size. Compression will find blocks which have no particular alignment.
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Re:ZFS Deduplication by atamyrat on Monday November 02, 2009 @01:43PM (#917514)
If they were same thing, you'd get the exact result, but not an approximation.

tar.x will compress chunks of data that is smaller than zfs block size. ZFS dedup + ZFS compression will compress them as well, so what's the problem?

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