Intel® Server System M20MYP1UR System Integration and Service Guide
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Appendix C.
System Status LED Operating States and
Definition
The system status LED shows the current health of the server system. The system provides two locations for
this feature; one is located on the front control panel and the other is located on the back edge of the server
board, viewable from the back of the system.
The Status LED on the front panel is an amber colored LED that is normally off when the system is operating
in a normal state, and is turned on or blinking when the integrated BMC determines that the system is
approaching a fatal state or has encountered a fatal error that has caused the system to halt.
The Status LED located on the back of the system is a bi-color Green and Amber LED with enhanced system
state status indication over that of the front panel. In addition to matching the critical system errors as those
supported by the front LED in blinking and solid on Amber, this LED also will indicate whether the system is
operating in a normal state (always on Green) or a degraded but operational state (Blinking Green).
When the server is powered down (transitions to the DC-off state or S5), the BMC is still on standby power
and retains the sensor and front panel status LED state established before the power-down event.
When AC power is first applied to the system, the rear and front status LEDs turns solid amber and then
immediately the rear status LED changes to blinking green to indicate that the BMC is booting. If the BMC
boot process completes with no errors, the rear status LED changes to solid green.
Table 2. System status LED state definitions
System State
BIOS Status Description
Front
Status
LED State
Rear
Status
LED State
System is not
operating.
•
No AC power / Stand-by power present
•
System is in S5 soft-off state.
Off
Off
System is
operating
normally.
•
System is running (in S0 State) and its status is healthy. The system is not
exhibiting any errors. AC power is present, and BMC has booted, and
manageability functionality is up and running.
•
After a BMC reset, and in conjunction with the chassis ID solid on, the
BMC is booting Linux*. Control has been passed from BMC uBoot to BMC
Linux* itself. It is in this state for roughly 10-20 seconds.
Off
Solid
green
System is
operating in a
non-critical
degraded state.
•
Fan redundancy loss. Applies only if the associated platform subsystem
has redundancy capabilities.
•
Fan warning or failure when the number of fully operational fans is less
than the minimum number needed to cool the system.
•
Non-critical threshold crossed
–
Temperature (including HSBP temp),
voltage, input power to power supply, output current for main power rail
from power supply and Processor Thermal Control (Therm Ctrl) sensors.
•
Unable to use all of the installed memory (more than 1 DIMM installed).
•
Correctable Errors over a threshold and migrating to a spare DIMM
(memory sparing). This indicates that the system no longer has spared
DIMMs (a redundancy lost condition). Corresponding DIMM LED lit.
•
In mirrored configuration, when memory mirroring takes place and
system loses memory redundancy.
•
Battery failure.
•
BMC executing in uBoot. (Indicated by Chassis ID blinking at 3Hz). System
in degraded state (no manageability). BMC uBoot is running but has not
transferred control to BMC Linux*. Server will be in this state 6-8 seconds
after BMC reset while it pulls the Linux* image into flash.
•
BMC Watchdog has reset the BMC.
•
Power Unit sensor offset for configuration error is asserted.
•
HDD HSC is off-line or degraded.
Off
Blinking
green
