Comment by fsmv

I recently did an arch with zfs root setup. You have to make a custom install ISO that has the zfs module to do it. After it's installed the main annoyance is the zfs module only works with certain kernel versions and often arch has updated the kernel to a version not supported. There's a repo with pinned kernel versions or you can just use the lts kernel.

FreeBSD is much easier but I needed better Linux compatibility for this machine