Wow just discovered that it's #zfs scrub on my 3 HDD array that heats my CPU to 85°C which results in a hard thermal shutdown from BIOS (previously unexplained).

The solution: lm-sensors & zpool scrub in an ugly script which periodically checks temp, pauses scrub before it hits 85 and restarts after a few mins wait to cool down.

If my son asks me "what you do as an infosec engineer" what do I say? 🤦‍♂️ 😂