Table 32 Memory subsystem events that might illuminate SID LEDs
Notes
Source
Cause
Sample IPMI Events
Diagnostic
LEDs
The failing DIMM
rank is deallocated
SFW
Detected that an SDRAM
is failing on the DIMM
Type E0h, 4000d:26d
MEM_CHIPSPARE_DEALLOC_RANK
DIMMs
SFW
DIMM type is not
compatible with current
DIMMs for this platform
Type E0h, 174d:26d
MEM_DIMM_TYPE_INCOMPATIBLE
DIMMs
SFW
Detected a fatal error in
DIMM serial presence
detect (SPD)
Type E0h, 173d:26d
MEM_DIMM_SPD_FATAL
DIMMs
Troubleshooting the power subsystem
The two power supply CRUs for the server provides N+1 redundancy for the server. Each power
supply CRU is identified by the server as 1 and 2 for logging purposes. The power supplies have
corresponding LEDs on the diagnostic LED panel.
Power supply CRU failures are identified visually by a single green LED that is turned off when one
or both of the power supplies fail; logged as an IPMI event by voltage sensor logic; and identified
as a power supply CRU failure by iLO3 turning on the appropriate LEDs on the front LED panel.
NOTE:
The Power Supply LED on the SID panel illuminates only when a failure or fault is detected
in a power supply. Loss of AC power to a power supply generates an SEL entry, but does not result
in the Power Supply LED becoming illuminated.
The System Health LED does not change status if AC power is removed from a single power supply
in a system with power redundancy.
Power subsystem behavior
For the server, each bulk power supply CRU provides 800 watts of DC power from a nominal 120
VAC, 50-60 Hz; and 1200 watts from a nominal 240 VAC, 50-60 Hz. The iLO MP chip located
on the system board controls the flow of +12 V DC power to the server CRUs. You can control and
display power supply status remotely with the iLO 3 MP
pc
and
ps
commands, respectively.
Typical power up sequence of the server is as follows:
1.
Power LED on front panel glows steady amber when one or two bulk power supplies are
plugged into nominal AC voltage and the +3.3 VDC housekeeping voltage comes on and
stays on whenever AC power is present.
2.
The iLO 3 MP, Flash memory, and server intrusion circuits are reset after the +3.3 V DC
housekeeping voltage stabilizes.
3.
The iLO 3 MP monitors the power button on the front panel.
4.
When the power button is pressed, iLO3 signals the bulk power supplies to fully power up.
5.
The +12 V DC rail comes up and all of the cooling fans and the various Voltage Regulators
come up sequentially.
6.
The iLO 3 MP signals when the server is ready to come out of reset (clocks are programmed
and stable, etc.).
7.
The server is brought out of reset, and begins the boot process.
Power LED button
The front panel system power LED indicates the status of system power. The LED is incorporated
inside the power button itself.
HP Confidential
Troubleshooting the power subsystem
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