How set fan speed (auto-or manualy slow down) on cloudline cl2200 gen10

[LM-Tech]

Hello, after different windows server version installation (2016/2022/2025) all 4 Case fan are spinning at 5600rpm. i've updated server firmware Bios, updated BMC firmware card (megarac sp-x v1.18.0) without success.

Unable to see a Fan menu into server BIOS, or into BMC webpage

Trying to set fan speed trough "ipmitool", trough ssh (putty or cmd line) by sending specific command to set the Fan management speed as "manual" and manually set speed to 30% or 20%... without success.

What is the correct process to decrease the speed of this server fans ? Kind regards.

[Mr_Techie]

Hi @LM-Tech,

Can you give a try to below instructions: 

1. Confirm temp sensors with ipmitool sensor list

2. Install IPMI driver in Windows (ACPI link to BMC)

3. Retry ipmitool raw for manual fan override

4. Test fan control via Redfish

5. Check FRU for OEM fan lockout

Let me know how it goes

[LM-Tech]

Hello @Mr_Techie 

thanks for your reply but except an audit of present fans i'm unable to obtain any other result, thanks for the help but i will recycle this server.

Kind regards

C:\Users\Administrator\Desktop\IPMI-TOOL>ipmitool.exe -I lanplus -H 192.168.1.4 -U XXXXXX -P XXXXXX sensor list all | find "FAN"
IANA PEN registry open failed: No such file or directory
BPB_FAN_1A | 5600.000 | RPM | ok | na | 800.000 | 1000.000 | na | na | na
BPB_FAN_2A | 5600.000 | RPM | ok | na | 800.000 | 1000.000 | na | na | na
BPB_FAN_3A | 5600.000 | RPM | ok | na | 800.000 | 1000.000 | na | na | na
BPB_FAN_4A | 5600.000 | RPM | ok | na | 800.000 | 1000.000 | na | na | na

[Mr_Techie]

@LM-Tech 

Got it.

From that sensor list, it's clear:

The fans are running, but the BMC has no temperature input — which means it’s running in failsafe mode, hence stuck at full speed.

No CPU Temp, System Temp, or any other sensors — so the BMC plays it safe and blasts fans at max.

You're absolutely right — in this state, no IPMI or OS trick will help. Without valid temp data, the fan logic simply won’t engage.

[printertales]

Sounds like the server’s stuck in full fan mode usually happens if sensors aren't reporting properly. Check if any temp sensors (like CPU or chassis) are missing or not detected in BIOS/BMC. Sometimes reseating components or clearing CMOS helps. Also, some servers only allow fan control with vendor-specific tools, not ipmitool. What brand/model is it?