Recently I upgraded my NAS to 18.104.22.168 - Omnius (revision 6400) and did a fully new install. Everything works great except that ZFS is extremely memory hungry to the point where it starts killing other processes (nfsd, lighttpd, ...). I'm only running it as a pure NAS with no VM's or anything. Secondly I've enabled vfs.zfs.arc_min (2G) and vfs.zfs.arc_max (10G) to well within my memory bounds. Furthermore I've enabled a swap partition as a zfs volume (4G).
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System Information Hostname muis.local Version 22.214.171.124 - Omnius (revision 6400) Compiled Monday January 21 22:45:46 CET 2019 Platform OS FreeBSD 11.2-RELEASE-p8 #0 r343240M: Mon Jan 21 03:24:40 CET 2019 Platform x64-embedded on Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz System Gigabyte Technology Co., Ltd. B360N WIFI-CF System BIOS American Megatrends Inc. Version: F2 04/19/2018 System Time Sunday March 17 20:02:24 CET 2019 System Uptime 8 Hours 45 Minutes 46 Seconds System Config Change Sunday March 17 11:17:41 CET 2019 CPU Frequency 100MHz CPU Usage 3% CPU Core Usage Core 0: 7% Temp: 29.0 °C Core 1: 3% Temp: 30.0 °C Core 2: 3% Temp: 30.0 °C Core 3: 1% Temp: 29.0 °C Memory Usage 99% of 15.69GiB Swap Usage 1% of 4.29GB Device: /dev/zvol/storage/swap | Total: 4.29GB | Used: 36.62MB | Free: 4.25GB Load Averages [Show Process Information] Disk Space Usage storage 23% of 15.94TB Total: 15.94TB | Alloc: 3.73TB | Free: 12.2TB | State: ONLINE
edit: I should note that my previous version from 2017 (forgot version, xml config says 1.7) did not have any issues, but also never utilized all memory.