I recently built a TrueNAS Scale server to replace a very successful and long running low power FreeNAS server. I used a Dell R720xd fully populated with drives, PERC flashed w/ IT mode, and the works. Love it.
One thing I noticed the server does is automatic chassis fan speeds. It runs ~4k RPM at idle and bumps up as needed when I’m doing anything processor or disk intensive. Nice feature.
I have a second server, an R720, that I run my apps and services on. I’ve struggled trying to find the settings that enable automatic chassis fans. I set the same BIOS system profile “Performance per Watt Optimized (DAPC)” and I verified through racadm that System.ThermalSettings and System.ThermalConfig settings are identical.
Researching online reveals a plethora of scripts and guides on manually setting fan speed, automating with a script, etc. I even wrote a script myself and it works great to keep fans silent at idle and pump up when CPU temp rises. I guess I could just keep using it. But I would really prefer the hardware do it on its own if I could.
Has anyone figured out how to enable automatic chassis fan speeds?