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88 Hot-Swapping Fans, SCSI Hard Drives, and Power Supplies
Hot-Swapping Power Supplies
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NOTE
You must have three power supplies installed to hot-swap a supply. If you
have only two supplies installed, they must occupy the left and center bays
(as you face the back of the server — see Figure 19 on page 89).
When the yellow power supply failure LED on the front panel turns on, you can determine which
power supply is defective by checking the three status LEDs on the back of each supply. If a
power supply fails, the yellow FAIL LED on the back of the power supply will be on continuously.
You must hot-swap the power supply—remove and replace it—with a good one. If the server
contains three power supplies, you DO NOT need to shut down the server to hot-swap a failed
power supply.
• Green PWR (Power) LED—when blinking, AC is applied to the power supply and standby
voltages are available. When on continuously, all power outputs are ready.
• Yellow FAIL(Power Supply Failure) LED—when on continuously, the power supply has
failed and it must be replaced.
• Yellow PR_FL (Predictive Failure) LED—when blinking, the power supply is about to fail
in the near future because the fan is performing poorly.
Power Supply LEDs
Power Supply Status
PWR (power)
(Green)
FAIL (power supply failure)
(Yellow)
PR_FL (predictive failure)
(Yellow)
No AC power Off Off Off
AC in/standby outputs on Blinking Off Off
DC outputs on and okay On Off Off
Power supply failure Off On Off
Current limit On Blinking/None Latch Off
Predictive failure On Off Blinking/Latched
Hot-Swapping a Power Supply
In a fully configured server, the power system contains three 750 watt autoranging power supplies;
the third one is redundant. If a single power supply fails in the redundant power system, the
yellow power supply failure LED on the front panel turns on. You can easily hot-swap the
defective power supply without turning the server power off.
Power supplies are hot-swappable only in configurations with three power supplies.
WARNING
Because of chassis airflow disruption, the power supply bay should not
be vacant for more than five minutes when server power is on.
Exceeding the five-minute limit may cause damage to certain peripheral
components.
Before replacing a power supply in a two-power supply configuration,
you must turn off power to the server.