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# 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
![System Setup](https://img-blog.csdnimg.cn/20210417133901664.png)
2.Enter iDRAC Settings
![iDRAC Settings](https://img-blog.csdnimg.cn/20210417134254886.png)
3.Set IPMI enabled
![IPMI](https://user-images.githubusercontent.com/128015241/225513933-2f728997-fc7c-417c-9d30-e5df5ad3cc61.png)
Select Network,Set IPMI become enabled
![Network](https://user-images.githubusercontent.com/128015241/225514012-3003977c-2961-4683-8d8c-8c615b6ed679.png)
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```
![IPMI](https://img-blog.csdnimg.cn/20210417135438275.png)
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