HP Integrity rx2800 rx2800 i2 User Service Guide - Page 89

Power LED button, Troubleshooting the cooling subsystem, Cooling subsystem behavior

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• +12 V dc comes up and all of the cooling fans and the various Voltage Regulators come up sequentially. • iLO3 signals when the server is ready to come out of reset (clocks are programmed and stable, etc.). • 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. It is incorporated inside the power button itself. The power button has a momentary switch (as opposed to a latching switch) that is recessed or covered to prevent accidental activation or deactivation. If the OS is up, pressing the power button for less than four seconds results in a graceful shutdown of the operating system and a subsequent removal of system power. Pressing the power button for greater than four seconds results in a hard shutdown (system power removed). While the server is booting (before the system has passed UEFI_EXIT_BOOT_SERVICES), the BMC immediately powers the server off on a button press, since there is no concept of soft shutdown in this state. In the event that the OS is absent or hung, or that the manageability subsystem (specifically the BMC) in the server is not responding, a greater than four second press of the power button is required to power off the system (a less than four second press on the power button has no effect). 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 39 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. Flash rate LED Off Steady Steady LED color Green Amber For high availability and safety reasons, this LED runs off the power rails, rather than under firmware control. Troubleshooting the cooling subsystem 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 iLO 3 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. Troubleshooting the cooling subsystem 89

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+12 V dc comes up and all of the cooling fans and the various Voltage Regulators come up
sequentially.
•
iLO3 signals when the server is ready to come out of reset (clocks are programmed and stable,
etc.).
•
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. It is incorporated inside
the power button itself.
The power button has a momentary switch (as opposed to a latching switch) that is recessed or
covered to prevent accidental activation or deactivation.
If the OS is up, pressing the power button for less than four seconds results in a graceful shutdown
of the operating system and a subsequent removal of system power. Pressing the power button for
greater than four seconds results in a hard shutdown (system power removed). While the server is
booting (before the system has passed
UEFI_EXIT_BOOT_SERVICES
), the BMC immediately
powers the server off on a button press, since there is no concept of soft shutdown in this state.
In the event that the OS is absent or hung, or that the manageability subsystem (specifically the
BMC) in the server is not responding, a greater than four second press of the power button is
required to power off the system (a less than four second press on the power button has no effect).
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 39 Power LED States
LED color
Flash rate
Definition
LED Off
No ac power to the system
Green
Steady
System power is turned on
Amber
Steady
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
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
iLO 3 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.
Troubleshooting the cooling subsystem
89