Hello Arno! I can confirm that the changes do work nicely (with the same symbol lookup errors you described).
In case it helps, I've notice an increase in the cpu usage when upgrading to 28 zfs pool version. Although it's not higher than 5-10% (running on a 4-cored amd64), It's noticeable on monitoring. I do suspect this to be a direct cause of deduplication, since the upgraded zpool handle thousand of files. Thanks! :-) Cheers, Dererk -- BOFH excuse #331: those damn raccoons!
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