ZFS without dedup will just run slower with less RAM available for caching, up to a point (I think the lowest I've seen someone run it with ARC configured to us

ZFS without dedup will just run slower with less RAM available for caching, up to a point (I think the lowest I've seen someone run it with ARC configured to use in recent memory is 128 MB? I believe 32 MB or so is the minimum below which OpenZFS will just ignore you if you try to tell it to use less...) I've seen people use it as a rootfs on RPis, and have personally run it on Pis for brief occasions without encountering any RAM problems.