HP ProLiant DL170e HP ProLiant DL170e G6 Server Maintenance and Service Guide - Page 67

Fan zoning, Nodes 3 and 4 both drive PWM speeds for Fan Zone 3 and 4.

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Fan zoning For HP ProLiant DL170e G6 server, a microcontroller is embedded on the bottom power backplane, providing the speed controlling over the system fans through the PWM's. The microcontroller supports four fan zones, each comprising of one fan: The microcontroller implements the fan speed controlling through the following ways: • The microcontroller will contain a two (for left and right zones) Fan PWM request registers specified in the BMC SDR's. All nodes will attempt to write to the left or right Fan zone registers and the microcontroller firmware will steer the PWM request into the correct register inside the microcontroller register set, based on which node has the GNT during the PWM I2C write. • Nodes 1 and 2 both drive PWM speeds for Fan Zone 1 and 2. • Nodes 3 and 4 both drive PWM speeds for Fan Zone 3 and 4. • Fans 1 and 2 (Zones 1 and 2) are critical fans for nodes 1 and 2. • Fans 3 and 4 (Zones 3 and 4) are critical fans for nodes 3 and 4. • The hottest (largest value) for each Fan Zone PWM requested over a 5 second window will be applied to the PWM outputs of each fan zone. Removal and replacement procedures 67

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Removal and replacement procedures
67
Fan zoning
For HP ProLiant DL170e G6 server, a microcontroller is embedded on the bottom power backplane,
providing the speed controlling over the system fans through the PWM’s. The microcontroller supports
four fan zones, each comprising of one fan:
The microcontroller implements the fan speed controlling through the following ways:
•
The microcontroller will contain a two (for left and right zones) Fan PWM request registers
specified in the BMC SDR’s. All nodes will attempt to write to the left or right Fan zone registers
and the microcontroller firmware will steer the PWM request into the correct register inside the
microcontroller register set, based on which node has the GNT during the PWM I2C write.
•
Nodes 1 and 2 both drive PWM speeds for Fan Zone 1 and 2.
•
Nodes 3 and 4 both drive PWM speeds for Fan Zone 3 and 4.
•
Fans 1 and 2 (Zones 1 and 2) are critical fans for nodes 1 and 2.
•
Fans 3 and 4 (Zones 3 and 4) are critical fans for nodes 3 and 4.
•
The hottest (largest value) for each Fan Zone PWM requested over a 5 second window will be
applied to the PWM outputs of each fan zone.