ServerFanSpeedControl

Objective: 1U,2U rack server change fan speed

\color{#FF3030}{UseByYourOwnRisk!!!}
Basic Information
Server：Dell PowerEdge R720
iDRAC Version：7
Operation System(To manage Server)：CentOS 8 / Windows

1.Enable IPMI Control

iDRAC 7
1.Enter System Setup
Use F2 to enter System Setup UI

2.Enter iDRAC Settings

3.Set IPMI enabled

Select Network,Set IPMI become enabled

2.Adjust Fan Speed

CentOS 8 User
1.Install IPMI

yum install epel-release -y 
yum install ipmitool -y  

2.Check IPMI is installed
rpm -qa | grep ipmi

3.Change Fan Speed

ipmitool -I lanplus -U ipmiUsername -P ipmiPassword -H ServerAddress raw 0x30 0x30 0x01 0x00 ipmiUsername：Username to login iDRAC，default = root
ipmiPassword：Password to login IDRAC，default = calvin
ServerAddress： IP of IDRAC address，NOT the operation systemIP or other VMs IP

0x00 = DISABLE manual operation
0x01 ENABLE manual operation

3.2 Change Spped

ipmitool -I lanplus -U ipmiUsername -P ipmiPassword -H ServerAddress raw 0x30 0x30 0x02 0xff 0x18   

0xff = Apply to ALL fan
0x18 = Percentage of the fan operate，The orginal Fan should be 12000rpm。0x18 is eqaul to 24 in decimal number.

0xff 0x18 = All Fan will operate in 24% of rpm, you can change 0xff to adjust each fan.

10% should be suitable for not high load operation (i.e. NAS or HomeAssistant)

================================================================== Windows User
You can use software by @cw1997

https://github.com/cw1997/dell_fans_controller/releases/

User：IDRAC LoginName，default = root
Password：IDRAC password，default = calvin
IP： iDRAC server IP，NOT VMs IP