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Set fan thresholds with ipmitool

My file server is sporting a SuperMicro X10SDV-4C-TLN2F-O motherboard and the case has two Noctua NF-R8 Redux-1800 PWM exhaust fans to keep things cool and quiet. However I noticed that whenever I set the fan mode in IPMI to Optimal, the fans began to pulse. They slow down, IPMI decides they’ve slowed down to critical levels and spins them back up again. Having no reason to be spinning this fast, they slow back down and the cycle continues again.
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