What's the proper way on FreeBSD 9 to tune ZFS parameters such as vfs.zfs.arc_max and vfs.zfs.vdev.cache.size? I've seen references to /boot/loader.conf, /boot/kernel.conf and /etc/sysctl.conf but I have none of those files.
adjust zfs settings on freebsd 9
freebsd;zfs
/boot/loader.conf is optional file which can be created by user to modify defaults (/boot/defaults/loader.conf)./etc/sysctl.conf is exists in /usr/src/etc, but it can be empty file also. it is not critical file too.I don't see any mention about /boot/kernel.conf in FreeBSD sources and /boot directory.so, you can do:(echo 'vfs.zfs.arc_max='; echo 'vfs.zfs.vdev.cache.size=')>> /boot/loader.conf (replace  with something useful) and reboot place same lines without double quotes into sysctl.conf and restart/reload sysctl