How to set up ZFS ARC mem size on #Ubuntu/ #Debian #Linux https://www.cyberciti.biz/faq/how-to-set-up-zfs-arc-size-on-ubuntu-debian-linux/ . #FreeBSD specific info here https://www.cyberciti.biz/faq/freebsd-set-up-zfs-arc-size-freebsd-unix/