I have a couple of HP ML 110 G5’s here in my office. I was doing some maintenance and did BIOS upgrades to them to the latest version available here. Immediately AFTER the BIOS upgrade, I noticed that the fans in the system ran at full speed ALL the time… the noise was intense in my little office. Like most of us however, I didn’t have time to dig into it and I left it be.
Over Christmas break I’ve been doing a little bit of work and finally the noise of these servers really got to me, so I decided to investigate. The HP support forums are actually full of people talking about this problem. Some have resolved it by downgrading their BIOS to an older version. The real answer though is not in the BIOS at all, but the Systems Management Firmware. You need to upgrade BOTH in order for the fans to slow down properly as they should. You can get the latest Systems Management Firmware here.
So buried in the release notes for the BIOS upgrade is a note as below. It is the only suggestion that we should do BOTH at the same time. In future I’ll be taking note of that tip!
When upgrading to BIOS version 2009.10.09 or later HP requires that the BMC version 3.11 or later is also installed on the system in order for proper server operation.
Now that I’ve done the upgrade to both, the loudest thing in my office is fan from the Netgear switch… hmmm must see about that too 🙂