Troubleshooting The Cooling Subsystem - HPE Integrity rx2800 i2 series User's & Service Manual

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
No AC power to the system
System power is turned on
System is shut down, but AC and housekeeping (standby)
power are active.
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
Fans (1-6)
Fans (1-6)
120 Troubleshooting the cooling subsystem
Sample IPMI Events
Type 02h, 0Ah:07h:01h
COOLING_UNIT_WARNING
Type 02h, 0Ah:07h:02h
COOLING_UNIT_FAILURE
Flash rate
LED Off
Steady
Steady
Cause Source
Fan has either iLO 3
previously failed
or is degrading
Fan has failed iLO 3
and no longer
meets minimum
requirements
LED color
Green
Amber
Notes
Cleared when fan is
replaced
Cleared when fan is
replaced