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I had a lot of 'fun' trying to get a ZFS root on ubuntu a couple months ago.

Not my brightest idea.

Ended up having a small XFS root partition and putting everything else on ZFS. Works great, but I don't look forward to the day when my root filesystem fails.

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Yep. I have a number of ZFS machines, and I always put root on ext4 (or ext4 on md), and just use ZFS for user data partitions.

ZFS root works fine on NixOS.

https://nixos.wiki/wiki/NixOS_on_ZFS

It is possible though, I set up a Ubuntu machine with ZFS root this christmas.

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