Ask anyone about running ZFS, and you’ll hear the same warning: it eats half your RAM. That used to be true on Linux, which is why so many people who build their own NAS with TrueNAS Scale open the dashboard, see a wall of memory marked as used, and a**ume something’s leaking. Except it isn’t half anymore. On current TrueNAS, ZFS will happily fill almost all your RAM, and that’s exactly what you want.