Sometimes we need to limit the fan speed in Dell PowerEdge server series maybe for the noise. The followings are the ipmi raw commands to setup the manual fan control which are very much undocumented.
|Enable manual fan control||
|Disable manual fan control||
|Set manual fan speed step||
I'm using Dell r720xd and setting
0x26 effectively limits the fan speed to around 8000 RPM. It is a somewhat safe value before you slowly set down the value to limit further down the fan speed.