Thanks for this mod! SATA DOM was running hot and spinning the fans, now, not. 
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Has anyone seen IPMI reset to default fan settings? I set the fan mode to Full and used ipmitool init scripts to configure the fans to stay at an acceptable speed.
This worked great until something caused my motherboard to revert to the optimal fan speed mode and start pulsing. It’s been up for a little over a month with no changes so I don’t know what would have caused it to suddenly switch fan modes.
I’d check to see via tmux what the fan script is blurting back at you. It could be worthwhile to have cron kill the fan script job on occasion and restart it on a monthly basis also.
The more important thing is that the rig reverted to a safe condition, ie your drives didn’t get roasted inadvertently.
I’m not using the fan script. I just set the fans to a fixed 80%. Temps have been fine. The optimal actually ends up with less airflow because it keeps oscillating.
What concerns me is what caused the fan mode to change from Full to Optimal.