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6-3
System Fans
It is very important that the chassis top cover is properly installed and making a
good seal in order for the cooling air to circulate properly through the chassis and
cool the components. See Figure 6-2.
The system chassis contains six 4-cm counter-rotating fans. Each fan unit is actu-
ally made up of two fans joined back-to-back, which rotate in opposite directions.
This counter-rotating action generates exceptional airfl ow and works to dampen
vibration levels.
System Fan Failure
Fan speed is controlled by system temperature via IPMI software. If a fan fails, the
remaining fans will ramp up to full speed. Replace any failed fan at your earliest
convenience with the same type and model (the system can continue to run with
a failed fan).
Replacing a System Fan (Figure 6-2)
1. Open the chassis while the system is running to determine which fan has
failed. Never run the server for an extended period of time with the chassis
open.
2. Turn off the power to the system and unplug the power cord from the power
supply.
3. Remove the failed fan's wiring from the fan header on the serverboard.
4. Lift the failed fan from the chassis and pull it completely out.
5. Place the new fan into the vacant space in the housing while making sure the
arrows on the top of the fan (indicating air direction) point in the same direc-
tion as the arrows on the other fans.
6. Reconnect the fan wires to the same chassis fan header as the previous fan.
7. Power up the system and check that the fan is working properly before re-
placing the chassis cover.
Chapter 6: Advanced Chassis Setup
6-3
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