Running in production for about 3 years with Ubuntu 20.04 / zfs 0.8.3. ZFS is being used as the datastore for a cluster of LXD/LXC instances over multiple physical hosts. I have the OS setup on its own dedicated drive and ZFS striped/cloned over 4 NVMe drives.

No gotchas / issues, works well, easy to setup.

I am looking forward to the Direct IO speed improvements for NVMe drives with https://github.com/openzfs/zfs/pull/10018

edit: one thing I forgot to mention is, when creating your pool make sure to import your drives by ID (zpool import -d /dev/disk/by-id/ <poolname>) instead of name in case name assignments change somehow [1]

[1] https://superuser.com/questions/1732532/zfs-disk-drive-lette...