Today I installed a second CPU in our HP ProLiant DL380e Gen8, and after booting the fans all went to 99.96%. This causes the server to make an enormous amount of noise.

Could it damage the server? What could I do to fix this? I already removed all the fans and put them back in, rebooted the entire server,...

I'm running HP_ESXi-5.1.0, CPU is twice Intel Xeon E5-2420 0 @ 1.90 GHz.

This is the current memory configuration: enter image description here

(before - after). Temperatures:

enter image description here

  • 3
    Sorry if this is a dumb question, but you installed the additional fans that come with the kit, correct?
    – Chris S
    Mar 18, 2014 at 16:58
  • Do you have any PCIe cards installed?
    – ewwhite
    Mar 18, 2014 at 17:10
  • Did you change your memory configuration to match the added CPU?
    – Chopper3
    Mar 18, 2014 at 17:15
  • I placed the extra fan (there was one with the CPU). This is what ESX is showing now: Imgur I also changed the memory configuration: Imgur Mar 18, 2014 at 19:32
  • @MaartenUreel Do you have any PCIe cards installed?
    – ewwhite
    Mar 18, 2014 at 19:51

2 Answers 2


Things to check in the absence of better information:


Your version of ESXi 5.1 is build 799733 and predates the hardware you're using. Update your ESXi, install the HP drivers if not there and make sure your system BIOS is current.

  • Should I update from ESXi 5.1 to 5.5 right away? Mar 19, 2014 at 15:21
  • @MaartenUreel You can go from 5.1 to a later version of 5.1. The current build number of 5.1 is 1612806. Moving to 5.5 may not be a good idea unless you're prepared for that migration.
    – ewwhite
    Mar 19, 2014 at 15:25
  • Allright, final question: should I just install ESXi510-201402001 (build 1612806) or first all the ones between my current version and that one? Mar 19, 2014 at 15:28
  • @MaartenUreel See this post about cumulative patches. I'd recommend the ESXi 5.1 Update 2 package, build #1483097. You can download that from VMware. Don't forget your server firmware updates.
    – ewwhite
    Mar 19, 2014 at 17:14
  • Thank you, I learned a lot from your help. I patched ESX to 1612806, I will perform the firmware updates next monday and put the second CPU back. I'll mark your answer as solution if the fans behave normally. Mar 19, 2014 at 18:49

After upgrading all the software, the fans kept blowing 99%. However I suddenly noted a warning during boot time that fan 1 was missing - I switched fan 6 to slot 1 and the issue is now resolved.

  • 2
    I didn't notice the error message that appeared for half a second, my bad. I expect the ESX software to show that error to me, or at least that the message doesn't just "flash by". Apr 10, 2014 at 7:08
  • 1
    There are lights on the server that show system health. The message wouldn't just "flash by", and the server would sit at an F1 prompt for 20 seconds before starting the boot process if there were an internal hardware problem like a missing fan. So what's wrong? The fan? The fan slot? The motherboard? What if you moved it all back to the original slots? Waste of time.
    – ewwhite
    Apr 10, 2014 at 11:58
  • 1
    You seem to be agitated :) When the fans went 100% the first time, I removed the CPU again and posted this topic. You advised me update firmware, software,.. which I then did, but the message could not appear or the status light could not flash because the second CPU wasn't in place. It was only two days ago, after I updated everything, I installed the CPU again and saw the message. So it's not like it has been flashing for over 2 weeks. I appreciate your help, but don't get pissed off because my problem was not caused by an outdated firmware. Apr 10, 2014 at 12:34

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