While it could very well be a bad wall receptacle or loose bad wiring, There is a possibility that has not been raised as best I can tell.
The disks are connected to an HBA card. The HBA card is overheating under heavy use. When not properly cooled the card may work fine most of the time then partway through some intensive operation, something intensive like a scrub or resilver, the card will overheat and start causing hardware errors.
Most HBA cards require way more air flow across the heatsink than one would think. Even some server chassis have issues cooling them sometimes depending upon layout and airflow patterns…
At least it is something to take a look at when the powr input issue is solved.
The replacement arrived and was installed last night. I successfully scrubbed, cleaned up any errors that came back, and scrubbed again to find that it looks clean!
terrehbyte@truenas:~$ sudo zpool status -v Main
pool: Main
state: ONLINE
scan: scrub repaired 0B in 04:11:49 with 0 errors on Fri Sep 26 09:06:18 2025
config:
NAME STATE READ WRITE CKSUM
Main ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
925e9ea6-5c01-467f-9609-faa9b1647fba ONLINE 0 0 0
643cad25-e3c2-4b98-9093-9ba24adec52a ONLINE 0 0 0
c3c6de1a-5af0-4df1-ae09-b0f8148f5d87 ONLINE 0 0 0
errors: No known data errors
I’ll keep checking (and let the scheduled scrubs continue to do their work), but I’m hoping I can call it good for a while and chalking it up to a potentially failing power supply at the moment.
The HBA card is new to this setup, so I’ll see if I can give it more cooling to avoid any heat related issues. I’ll also make a note to check on what the electrical situation looks like, per everyone’s notes above.
put a small fan blowing directly on the heat sink for cooling. They need lots for forced air cooling across the heat sink. The cards are designed for servers with lots of fans screaming at high rpm forcing volumes of air through a chassis and even then placement within the chassis may make a need for added direct cooling.
