C220 M4 — Fans running at maximum speed without alarms on CIMC 4.1(2m)

[Ander Vazquez]

Hi everyone,

I have a Cisco C220 M4 server with the following firmware versions:

• BIOS: C220M4.3.0.4c.0.0502191259

• CIMC: 4.1(2m)

The issue I'm facing is that the fans are spinning at extremely high speeds, generating excessive noise, although they are reported as Normal in CIMC and no alarms are shown. Here are some of the readings:

FAN1_TACH1 Normal 16000 RPM
FAN1_TACH2 Normal 20000 RPM
FAN2_TACH1 Normal 17100 RPM
FAN2_TACH2 Normal 18400 RPM
...

Configured fan policy: Low
Installed PCI devices:

• Cisco 12G SAS Modular RAID Controller

• Intel® I350 1Gbps Network Controller

Actions taken:

• Server reboot

• Verified fan policies

Despite the reboot and confirming the fan policies are set to Low, the fans remain at these high speeds.

Has anyone experienced a similar situation on CIMC version 4.1, or have any ideas about what could be causing this behavior?

Any suggestions or shared experiences would be greatly appreciated.

Thanks in advance!

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[Ander Vazquez · Accepted solution]

The complete shutdown with power removal for more than 60 seconds had already been performed a couple of times, but without a satisfactory result.
I replaced the front panel from a spare UCS we have, and with that, the fans have stopped failing.

Thank you for everything!