iDrac 7 and 8: Lower fan noise on Dell Servers

I have a Dell R720xd and its default fan curve is… aggressive. Here is how i found to lower the fan speeds so its not a constant vacuum cleaner in my living room.   Set fan speed properties via iDrac Enable SSH on iDrac. Connect then connect to it and run: racadm set system.thermalsettings.FanSpeedOffset 255
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