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I have FreeBSD 8.2 installed on AMD/64 with 3 GB RAM and 690 GB pooled HD under ZFS. I have two copies of an identical file (180 MB video) in same directory and yet df -h indicates that both are using storage. I thought de-dupe was "built-in" with ZFS. Have I configured something wrong?

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FreeBSD 8.2 only supports ZFS v15, but dedupe requires at least v21. Link

I think that dedupe is coming with FreeBSD 8.3.

Other considerations:

  • Depending on your pool setup, dedupe doesn't necessarily happen in real time.
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