Single Status Update
Google Chrome: *Uses a lot of RAM*
ZFS: "Hold my beer..."
Oh dear god if ZFS was that CPU heavy nothing could handle it. 20 disks don't put that much of a load on the CPU. What you're looking at there is 56 threads of BOINC. More specifically WCG/OpenPandemics. I've left 8 threads free so the system can still serve the purposes I need it to. The server is running on what I call summer hours so it's only under load 12 out of 24 hours a day.
Here's a more accurate screenshot:
ZFS IS using all that RAM though. To be honest if you're familiar with ARC you'll know that you don't need this much RAM to use ZFS but it is VERY nice to have.