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6-3
System Fans
Six 4-cm fans provide the cooling for the system. 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 SC116 chassis contains counter-rotating fans. Each fan unit is actually made
up of two fans joined back-to-back, which rotate in opposite directions. This counter-
rotating action generates exceptional airflow 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).
The SC116 chassis includes four pre-installed fans. One additional open slot is
available so that one more fan may be added if additional cooling is required.
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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