BTW, the experience with dedup is that doing things off-line means
never catching up, while doing them online means going slow.

You might cache as much as you can in memory then go slow when you
miss the cache...

In practice I think it's best to separate data and metadata devices so
that you can make metadata as fast as you can, writing COW-style, like
ZFS does, and caching in memory on clients and servers as much as
possible for all data writes during the writes until they are
committed.

Nico
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