Improve ZFS Performance
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Just something I ran across don't know if this will work on pfsense 2, can some one test
Improve ZFS Performance:
Tweaking the Boot Loader
ZFS will not work smoothly without tweaking the system parameters.
You can tweak your boot loader (/boot/loader.conf) using the following parameters:#Your Total Physical Memory minus 1 GB
vm.kmem_size="3g"
vm.kmem_size_max="3g"#512MB should be fine.
vfs.zfs.arc_min="512m"#Your Physical Memory minus 2GB
vfs.zfs.arc_max="2048m"#Set the following to 1
vfs.zfs.vdev.min_pending="1"
vfs.zfs.vdev.max_pending="1"http://icesquare.com/wordpress/how-to-improve-zfs-performance/