Fast Dedup

["gea@napp-it.org" <gea@napp-it.org>]

Dedup
When realtime dedup was implemented in ZFS many years ago I thought,
wow, a real killer feature. Shortly after it was clear that it has
negative implications on RAM usage up to a catastrophic impact on RAM
performance especially in low RAM situations. In nearly all cases, the
general recomendation was then, keep it off.

In my current tests with Open-ZFS on Windows, currently 2.2.6 rc where
the new Fast Dedup feature is part of with newest commits from this
week, i came to the conclusion, that this time it can be the killer
feature as it improves performance, limits dedup table size to a value
or size if a dedup vdev and can clean up tables. Maybe in most cases it
can be enabled by default similar to the compress feature as it offers
mostly more advantages than disadvantages.

I hope this will be integrated in Illumos as the amount of advantages of
Illumos ZFS over generic Open-ZFS is limited to usability, stability and
the kernelbased SMB server as more and more newer ZFS features are not
available what affects compatibility.

Gea



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