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Man, I wish zfs had this. Or a periodic scan, maybe run with a flag as part of, or after, a scrub. The current implementation of dedup in zfs was the biggest d

Man, I wish zfs had this. Or a periodic scan, maybe run with a flag as part of, or after, a scrub. The current implementation of dedup in zfs was the biggest disappointment I had in setting up my current storage box. Even with plenty of horsepower, I quickly turned it off and accepted the net reduction in capacity.

toast0 7y ago
There is a command, zdb -S pool [1], that scans the pool to generate a report about duplication --- of course, it doesn't make changes. [1] I put the wrong command here originally.
- beerandt 7y ago
  As in, it reports any deduplication already implemented? Or actually detects duplicate blocks? Because that would be still be something, knowing how much deduplication would benefit you, if implemented.
  - agapon 7y ago
    https://www.freebsd.org/cgi/man.cgi?query=zdb&sektion=8 https://www.freebsd.org/cgi/man.cgi?query=zdb&sektion=8
  - toast0 7y ago
    Actually detect duplicate blocks. There's also commands to show the already implemented deduplication, of course.
- agapon 7y ago
  You are thinking of zdb -S, of course.