Hi Brendon,
I've been reading various sites about performance tuning (many are by you I guess) while trying to get my head around ARC, etc. I am a near zfs novice trying to understand what is going on with this zfs system so please bear with my questions if they seem stupid!
The attachment shows the stats for a core i7 MacMini with 16 GB of RAM with 10.11.4 running the 1.4.5 kexts and two 4-disk RAIDz disk arrays (one backs up the other) on external USB3. The main HDD is running nothing else but the system. It is not heavily used and basically is for archiving about 6 TB of data with may be a few dozen file changes each day. The emphasis is on keeping a stable secure archive rather than fast I/O.
Do you think these stats fall into the normal ballpark given this background—especially the 0 result for sysctl kstat | grep arc_max.