How to manually control fan speed on SKY-7632?

Purpose:

Fans operate in smart mode by default, it speeds up or slows down based on the temperature returned from sensors. Expose the IPMI commands for manually controlling system fans. 

Target Audience:

Users who have SKY-7632 and running in a Linux environment.

4 FAN cables location on PCB board

Steps:

1. Check fan status (FAN1,FAN2,FAN3,FAN4)

# ipmitool sdr type fan
PSU1_FAN-SPEED | 5Fh | ok | 10.0 | 1800 RPM
PSU2_FAN-SPEED | 69h | ok | 10.1 | 7650 RPM
FAN_1-SPEED | 6Ah | ok | 29.0 | 3900 RPM
FAN_2-SPEED | 6Bh | ok | 29.1 | 3900 RPM
FAN_3-SPEED | 6Ch | ok | 29.2 | 3800 RPM
FAN_4-SPEED | 6Dh | ok | 29.3 | 3900 RPM

2. Enable the fan speed to 75%(Fan Duty Cycle) in FAN1(0x00) 

# ipmitool raw 0x2c 0x15 0x00 0x00 75

3. Check FAN speed status

# ipmitool sdr type fan
PSU1_FAN-SPEED | 5Fh | ok | 10.0 | 1800 RPM
PSU2_FAN-SPEED | 69h | ok | 10.1 | 7500 RPM
FAN_1-SPEED | 6Ah | ok | 29.0 | 8600 RPM
FAN_2-SPEED | 6Bh | ok | 29.1 | 3400 RPM
FAN_3-SPEED | 6Ch | ok | 29.2 | 3400 RPM
FAN_4-SPEED | 6Dh | ok | 29.3 | 3400 RPM

4. Set FAN1 speed back to smart controlling mode(0xff).

# ipmitool raw 0x2c 0x15 0 0 0xff
00

5. Same way in Fan2 (0x01), Fan3(0x02) and Fan4(0x03)

PS:

Example of FAN Duty Cycle