Kontron AM4901 IPMI - Manual (Page 23)

AM5901/AM4901 IPMI Firmware User Guide
ID: 1035-8760, Rev. 3.0 Page 23
3.7 Anomalous Behavior and Status Indications
System operational states, anomalies, and error recording are indicated by the use of LEDs,
an Eventlog, and error variables.
Status information is provided by the following:
• IPMI System Eventlog (SEL) - by reading the System Eventlogs states such as overtem-
perature or under- overvoltage conditions can be detected
• The error variable - it can be read out via the CLI command “showerror”
System failures are indicated by the Health LED on the MCH being lit (red).
In the following cases the MCH itself will attempt to resolve critical situations:
• Temperature problems in the system: the fan regulation will attempt to resolve the prob-
lem
• Configuration problems: it is possible that a reset will be performed in order to have au-
tomatically set configuration parameters take effect
For failures, the MCH Health LED will light up red. In such cases, it is recommended to check
the error variable as described above. Random runtime failures such as a communications fail-
ure (M state 7) for an AMC module are non-self-clearing. Non-self-clearing means that when
such a failure is resolved it is not automatically cleared in the error variable. Such failures can
only be cleared by issuing the CLI command “clearerror”. Other failures are self-clearing. For
example, a temperature failure clears itself when the temperature returns to normal. The clear-
ing of a failure can lead to the Health LED going green when no other non self-clearing failure
exists.
When a failure in an AMC module occurs, the Health LED of the failed module lights up red. In
addition, the failure cause is usually recorded in the Eventlog of the MCH, because the AMC
module has reported the failure to the MCH. Only in the event of a temperature failure, the red
Health LED of the AMC module and the red Health LED of the MCH will be active.
3.8 LEDs
3.8.1 Blue Hot Swap LED
The Hot Swap LED indicates the Hot Swap state of the MCH in the case that power is applied.
At power on, the LED lights up and the MCH is at first inactive. The Hot Swap switch must be
closed to manually activate the MCH. To manually deactivate the MCH, the Hot Swap switch
must be opened. During the state change, the LED blinks and in the active state of the MCH it
is off. The MCH may only be removed from the system when it is deactivated.
3.8.2 Out Of Service (OOS) LED
The Out Of Service LED is lit as long as the MCH is not operating. This is the case when it is
in an un-programmed state, during updating of the Firmware, and when resetting.
3.8.3 Health LED
The Health LED of the MCH indicates its operational state. As long as the MCH is operating,
the LED blinks green (“Heart Beat”). In case of a failure, the LED blinks red, green, red, ...