@james: "I have a (hopefully) simple question about ZFSv28 deduplication that is not
very clearly answered in any of the documentation I've found.
If I enable dedupe on a dataset, will newly written data dedupe against old
data that was written before dedupe was enabled?  If not, is it worth
forcing the data to be rewritten so that it makes it into the appropriate
tables?
  James L. Lauser
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    @fjwcash: "<quote>
only contains entries for data written after the "dedup" property is set on
a filesystem.
The only way to dedupe existing data is to copy/delete it, or "zfs send|zfs
recv" it, or otherwise re-write it.
Freddie Cash
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    @james: "Thanks for the info.  This is what I suspected, but just wanted to verify.
Given this, then the 1.11x ratio shown for dedup in 'zpool list' means that
of the data that was written since dedup was enabled, it deduped at a ratio
of 1.11:1?
  James L. Lauser
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