First you need to make sure IPMI Over LAN is enabled in Idrac setting. Go to Idrac settings -> Network -> IPMI Settings, enable the configuration and leave other settings.

Get a system which has Impitool, for me i used linux subsystem under Windows and it works great, but any other system should also works. Get into the shell using Windows Terminal, for me its an Ubuntu subsystem so i just need to

Then we need to enable fan control manual mode by

You can also disable it anytime using

With manual control mode enabled, we can run following command to control the fan speed

• 0% Fan Speed

• 5% Fan Speed

• 10% Fan Speed

• 20% Fan Speed

• 30% Fan Speed

Just need to change the last parameter to the fan speed percentage to hex so 50% would be 0x32

When done you can use the following command line to read the current fan speed

Change the fan name in quote to what you read from Idrac fan list.

For 720xd, run