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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  
+ 
+
+
+
+