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NOTE: For high availability and safety reasons, the power LED is run directly from the power
rails, not under firmware control.
Power Supply Power LED
There are 1 Hz flashing green POWER LED (PWR) located on each power supply, which indicate
that ac power is applied to the power supply, and that housekeeping voltages are available in
the server. These LEDs light steady green when power is available from the power supplies to
the server. If a power supply LED flashes amber at 1 Hz, the power supply has failed.
Table 5-20 lists the power supply LED states:
Table 5-20 Power Supply LED States
Power Supply ConditionPower Supply Power LED
No ac power applied to any power supplyOff
No ac power applied to a specific power supplyOff
ac standby power is presentFlashing green ~ 1 Hz
Power supply dc outputs are functioning correctlySteady green
Power supply has failed. (includes overvoltage, overcurrent, overtemperature,
and fan failure)
Flashing amber ~ 1 Hz
I/O VRM
Table 5-21 lists the I/O power events that light the diagnostic panel LEDs.
Table 5-21 I/O Power Events that Light Diagnostic Panel LEDs
NotesSourceCauseIPMI EventDiagnostic
LED
A voltage on the I/O power
assembly is out of range ( too
low)
BMCVoltage on
CRU is
inadequate
Type 02h, 02h:07h:03h
VOLTAGE_DEGRADES_TO_NON_RECOVERABLE
I/O power
Cooling Subsystem
The three fan cooling zones located in the rx3600 chassis provide N+1 redundancy for the chassis
using three identical dual fan assembly CRUs. In turn, each dual fan assembly FRU provides
additional N+1 redundancy for the fan cooling zone it cools. The fan assembly CRUs are identified
in the chassis as fans 1, 2, and 3 both for logging and for fault identification on the diagnostic
LED panel.
Cooling Subsystem Behavior
The BMC chip located on the core I/O board FRU controls fan speed based on ambient air
temperatures, chip temperatures, server configuration, and fan operation or failure. Air is drawn
through the front of the chassis and pushed out the rear by the cooling fans.
NOTE: You can display fan status remotely using the iLO 2 MP ps command.
Within HP Integrity rx3600 servers, temperature sensors report chassis temperatures to the BMC,
which controls fan speed based on this information.
Table 5-22 lists the cooling subsystem events that light the diagnostic panel LEDs.
166 Troubleshooting