White Papers

System Thermal Profile settings
7 Custom Cooling Fan Options for Dell EMC PowerEdge Servers
This option is used to provide additional cooling to custom configurations to the customer. The thermal
algorithm maintains enough cooling without application of such offsets. The common use case is to add
additional cooling to custom PCIe adapter cards, or to reduce the system exhaust temperature for platforms
that do not support these specific customizations.
Illustration of how the fan speed offset increases the fan speed above the baseline (green line)
2.2 Minimum Fan Speed (MFS)
The MFS option allows the user to stipulate a lowest setting below which fans cannot drop. This setting is
defined granularly as a percentage of the fan speed range, or % PWM.
System fans can run higher than the fan speed that the MFS option sets unless set to 100-percent, but not
lower. For example, setting the MFS at 35-percent prevents the fan speed from dropping below 35% PWM.
NOTE: 0% PWM does not indicate that the fan is off. 0% PWM is the lowest fan speed that the fan can
achieve.
The following figure illustrates how the MFS setting works along with the automatic controls: