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Set Fan Offset on Dell Power Edge

The BMC/iDRAC in is programmed to set fan speed min/max and adjust values based on factors like ambient temperature and system configuration. Depending on configuration the system may run the fans at higher RPMs regardless of any detected temperature.

If you set Maximum Performance in BIOS (Power Management), there is no way to adjust fan speed because when server start, IDrac set Fan Speed Offset to Max.

I used this on PowerEdge R620 but this adjustment can also be used on other Dell servers.

Using Racadm​

Set FanSpeed Offset value in IDrac via racadm.

Ssh to idrac​

ssh root@idrac-ip-address

Get SpeedOffset value​

racadm get system.thermalsettings.FanSpeedOffset

Set SpeedOffset value​

The X values are:

  • 0 - Low Fan Speed
  • 1 - High Fan Speed
racadm set system.thermalsettings.FanSpeedOffset X

Using IPMI Tool​

Install IPMI Tool​

sudo apt install ipmitool

Manual Fan Control​

  • Enable Manual Fan Control
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x01 0x00
  • Disable Manual Fan Control
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x01 0x01

3rd Party PCIe Response State​

  • 3rd Party PCIe Response State (Fast fan speed when no therm sensors on PCIe card)
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0xce 0x01 0x16 0x05 0x00 0x00 0x00

Result1= ... 00 00 00 (Enabled)

Result2= ... 01 00 00 (Disabled)

  • Enable 3rd Party PCIe Response
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0xce 0x00 0x16 0x05 0x00 0x00 0x00 0x05 0x00 0x00 0x00 0x00
  • Disable 3rd Party PCIe Response
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0xce 0x00 0x16 0x05 0x00 0x00 0x00 0x05 0x00 0x01 0x00 0x00

Set All Fan Speed​

  • Set All Fans (0xff) to % (??) Speed (in Hexadecimal) -- See Table Below for Hex Value
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x02 0xff 0x??
  • Set All Fans (0xff) to 50% (0x32)
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x02 0xff 0x32

Set Individual Fan Speed​

  • Set Fan1 (0x00) to 30% (0x1E)
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x02 0x00 0x1E
  • Set Fan2 (0x01) to 30% (0x1E)
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x02 0x01 0x1E
  • Set Fan3 (0x02) to 30% (0x1E)
ipmitool -I lanplus -H idrac-ip-address -U username -P password raw 0x30 0x30 0x02 0x02 0x1E
NOTE

System fan #'s vary per chassis. Fan1 starts on the left side behind the Dell logo and can go up to 7 fans to the right side behind the Intel badge. The IPMI fan numbers are NOT the same as the Fan# labels on the chassis. Fan1=0x00, Fan2=0x01, Fan3=0x02, Fan4=0x03, Fan5=0x04, etc.

Percentages to Hexadecimal & Fan Speed Table​

Percentage %HexadecimalRPM
10%0xA
11%0xB
12%0xC
13%0xD
14%0xE
15%0xF
16%0x103,300 RPM
17%0x11
18%0x12
19%0x13
20%0x143,900 RPM
21%0x154,000 RPM
22%0x164,200 RPM
23%0x174,300 RPM
24%0x184,400 RPM
25%0x194,500 RPM
26%0x1A4,700 RPM
27%0x1B4,800 RPM
28%0x1C5,000 RPM
29%0x1D5,100 RPM
30%0x1E5,200 RPM
31%0x1F5,400 RPM
32%0x205,500 RPM
33%0x215,700 RPM
34%0x225,800 RPM
35%0x236,000 RPM
36%0x246,100 RPM
37%0x256,200 RPM
38%0x266,300 RPM
39%0x276,500 RPM
40%0x286,600 RPM
41%0x29
42%0x2A
43%0x2B
44%0x2C
45%0x2D7,300 RPM
46%0x2E
47%0x2F
48%0x30
49%0x31
50%0x328,000 RPM
51%0x33
52%0x34
53%0x35
54%0x36
55%0x37
56%0x38
57%0x39
58%0x3A
59%0x3B
60%0x3C9,400 RPM
61%0x3D
62%0x3E
63%0x3F
64%0x40
65%0x41
66%0x42
67%0x43
68%0x44
69%0x45
70%0x4610,800 RPM
71%0x47
72%0x48
73%0x49
74%0x4A
75%0x4B
76%0x4C
77%0x4D
78%0x4E
79%0x4F
80%0x5012,100 RPM
81%0x51
82%0x52
83%0x53
84%0x54
85%0x55
86%0x56
87%0x57
88%0x58
89%0x59
90%0x5A13,300 RPM
91%0x5B
92%0x5C
93%0x5D
94%0x5E
95%0x5F
96%0x60
97%0x61
98%0x62
99%0x63
100%0x6415,000 RPM