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ProLiant DL20 Gen9 Loud Fan 3

Occasional Advisor

ProLiant DL20 Gen9 Loud Fan 3

ProLiant DL20 Gen9 server was originally purchased without any drives (4SSF model) and fan 3 would never go below 47% while fan 1 and 2 would slow down to 6% after post. 

Original Bios version: 1.50
Original iLO version: 2.30

Surprisingly the fan problem got resolved after we added SAS drives to the server and configured the raid array, however write speeds of the H240 were bad so we upgraded to P440/4GB.

Noisy fan problem came back and would not go away even after we set up new raid array on the new P440 controller. (P440 came with firmware 1.34)

After doing a quick search we could see others having similar problem with their DL servers and firmware update fixed it for some, but not for us.

Updated Bios to 1.6
Updated iLO to 2.40
Updated P440 to 3.56
B140 has the original 2.5.2 firmware and complains at the post about not being configured.

Server is configured with UEFI mode

Does anyone have a solution to slow down fan 3?

Edit: looking at this post it sounds like the problem is related to add-on cards.
When raid controller was replaced, an Intel Quad port NIC was added. (will take it out if it's causing the problem)





 Thank you


Occasional Advisor

Re: ProLiant DL20 Gen9 Loud Fan 3

with the Intel NIC removed Fan 3 is steady at 15% after system boots in to the OS

Would fan 3 remain at the same speed if any of the HP nics is installed?

HP Ethernet 1Gb 4-port 331T Adapter 647594-B21
HP Ethernet 1Gb 4-port 366T Adapter 811546-B21
HP Ethernet 1Gb 2-port 361T Adapter 652497-B21
HP Ethernet 1Gb 2-port 332T Adapter 615732-B21




Re: ProLiant DL20 Gen9 Loud Fan 3

All firmware updated, System runs fan 3 at 100% all the time. Temp sensors are all good.


Sound is driving me nuts. ANy help resolving this would be appreciated.


Re: ProLiant DL20 Gen9 Loud Fan 3

If I reset iLO4 then the fan speed will go down to 47% for awhile, but then seems to always end up back at 100%, usually after a reboot.


Re: ProLiant DL20 Gen9 Loud Fan 3

Did you see this article, which is specific to the DL20?


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Re: ProLiant DL20 Gen9 Loud Fan 3

Yes, I have seen that posting.


  • The driver or firmware may be outdated or may be uninstalled - All driver are updated
  • The Hard Drive is running in AHCI or Legacy mode - No idea how to check mode
  • Certain third-party PCI cards are installed - None installed
  • No storage drive is installed - All 4 hard drive bays are populated