Limiting Fan Speed in Dell Poweredge Series

Adam Basfop Cavendish

2020-05-31 22:22

Linux

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.

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Function	`ipmitool raw` command
Disable manual fan control	`ipmitool raw 0x30 0x30 0x01 0x01`
Enable manual fan control	`ipmitool raw 0x30 0x30 0x01 0x00`
Set manual fan speed step	`ipmitool raw 0x30 0x30 0x02 0xff 0x??`

I'm using Dell r720xd and setting 0x?? to 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.

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