I recently got my hands on a Cisco C240 M4SX with 24 drive bays. It’s equipped with a Cisco 12G SAS Modular RAID Controller, but I’ve run into an issue I can’t seem to solve.
From what I’ve read, using a non-Cisco PCIe adapter causes the system fans to stay in high-power mode. However, in my case, I am using a Cisco controller, so I’m unsure why the fans are still running at full speed.
I’ve searched everywhere, but it seems like no one has a clear solution. If you’ve dealt with this or have any advice, I’d love to hear:
- Debugging steps I can take?
- Any potential fixes or workarounds?
- Is reflashing the controller firmware worth trying?
I’m open to all suggestions—please share your expertise!
TL;DR: Cisco C240 M4SX fans stuck in high-power mode even with a Cisco 12G SAS Modular RAID Controller. Any advice on fixing this?
