To ensure that the system powers up in a deterministic fashion, the power button must be masked for four
seconds after a power-down.
Table 35: Power LED States
Definition Flash rate LED color
No AC power to the system LED Off
System power is turned on Steady Green
System is shut down, but AC and housekeeping (standby)
power are active.
Steady Amber
For high availability and safety reasons, this LED runs off the power rails, rather than under firmware
control.
Troubleshooting the cooling subsystem
Cause
The fans located within the server provide N+1 redundancy for the server using six identical dual fan
assembly CRUs. In turn, each dual fan assembly CRU provides additional N+1 redundancy for the fan
cooling zone it controls. Each dual fan assembly CRU is identified by the server as fans 1 through 6 both
for logging purposes and for fault identification on the diagnostic LED panel.
Cooling fan CRU failures are identified visually by a single green LED on the dual fan assembly CRU that
is turned on when one or both of the fans fail; logged as an IPMI event by fan sensor logic; and identified
as a fan assembly CRU failure by iLO 3 turning on the appropriate LEDs on the System Insight Display
panel.
Cooling subsystem behavior
The iLO 3 MP controls fan speed on ambient air temperatures, chip temperatures, server configuration,
and fan operation or failure. Air is drawn through the front of the server and pushed out the rear by the
cooling fans. You can display fan status remotely with the iLO 3 MP ps command.
Within the server, temperature sensors report server temperatures to iLO 3, which controls fan speed
based on this information.
Table 36: Cooling subsystem events that illuminate SID LEDs
Diagnostic
LEDs
Sample IPMI Events Cause Source Notes
Fans (1-6) Type 02h, 0Ah:07h:01h
COOLING_UNIT_WARNING
Fan has either
previously failed
or is degrading
iLO 3 Cleared when fan is
replaced
Fans (1-6) Type 02h, 0Ah:07h:02h
COOLING_UNIT_FAILURE
Fan has failed
and no longer
meets minimum
requirements
iLO 3 Cleared when fan is
replaced
120 Troubleshooting the cooling subsystem
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