Power supply fans

Power supply fans are monitored and controlled by the power subsystem. A fan failure (predicted or current) will show up in the IMM System Event Log (SEL) as a “Power Unit 0x01h” failure event and a GSM event will show up as “Power Unit Failure Detected.” Power supply fans are not monitored by the mini-BMC, therefore no SEL or GSM events will be reported with the mini-BMC configuration.

When a predicted or current fan failure is reported, the server must be opened to determine which fan is having problems. LEDs on the power distribution board will indicate which fan requires attention. The appropriate LED will blink to indicate a slow fan and light to show a failed fan. The PS Fan 1 is on the left side of the module.

PS Fan 1 LED

PS Fan 2

LED

To replace a power supply fan:

1 Follow the instructions in “Preventing static electricity discharge” on page 41. Make sure that you turn off the server, then unplug the power cord(s) and all other cables connected to the server.

2 Follow the instructions in “Opening the server case” on page 42.

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