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C240 M4 - fan speed issues

I have a couple C240-M4SX servers running ESXi 7.0. I had a really odd issue with one of them the other day. 3 the fans (3,4,5) were running at much higher speed than the others, and the noise was starting to get to me since they are in my home office. I switched individual fans, the whole fan tray, but the problem persisted. On a bit of a whim I decided to reboot the CIMC, and the problem went away. I believe I am on the most current firmware (BIOS C240M4.4.1.2e.0.0615220033, CIMC 4.1(2k)). Has anyone else seen this before? FYI, the power policy is set to "Low".

4 Replies 4



             - FYI


-- ' 'Good body every evening' ' this sentence was once spotted on a logo at the entrance of a Weight Watchers Club !

Thanks, but I don't think that is it. The bug you mentioned was for single CPU systems and a much older firmware version than what I am running. Mine is dual CPU (E5-2697A v4 @ 2.60GHz) with 256G RAM, (1) UCSC-PCIE-C10T-02, and (1) UCSC-MLOM-C40Q-03.

Kirk J
Cisco Employee
Cisco Employee

Reboot of CIMC resolving high RPM fan problem, does seem like hung process, or low CIMC memory issue.

Would have to review CIMC logs and look at entries prior to reboot to see what specifically was going on.

Just because it's running recent code, doesn't mean you didn't hit some sort of corner case.


True enough. I'll have to keep that in mind in case it happens again. Rebooting the CIMC is a low/no impact thing.

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