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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″