vfs.zfs.arc_max: 7165603840

root@momh167-gjp4-hpelitebook8570p-freebsd:~ # sysctl vfs.zfs.arc_max
vfs.zfs.arc_max: 7165603840
root@momh167-gjp4-hpelitebook8570p-freebsd:~ # grep -v \# /boot/loader.conf | grep vfs.zfs.arc_max
root@momh167-gjp4-hpelitebook8570p-freebsd:~ # echo 'vfs.zfs.arc_max="8192M"' >> /boot/loader.conf
root@momh167-gjp4-hpelitebook8570p-freebsd:~ # grep -v \# /boot/loader.conf | grep vfs.zfs.arc_max
vfs.zfs.arc_max="8192M"
root@momh167-gjp4-hpelitebook8570p-freebsd:~ # date ; uptime ; uname -n ; uname -v
Sat Jul 15 10:12:44 BST 2017
10:12AM  up 16:07, 2 users, load averages: 0.45, 0.53, 0.69
momh167-gjp4-hpelitebook8570p-freebsd
FreeBSD 12.0-CURRENT #0 r320599: Mon Jul  3 15:34:15 UTC 2017     root@releng3.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC
root@momh167-gjp4-hpelitebook8570p-freebsd:~ # shutdown -r +5
Shutdown at Sat Jul 15 10:19:21 2017.
shutdown: [pid 5377]
root@momh167-gjp4-hpelitebook8570p-freebsd:~ #
*** System shutdown message from root@momh167-gjp4-hpelitebook8570p-freebsd **
*

System going down in 5 minutes