Chassis Faults

Chassis faults are external faults: there is no hardware failure, but an external condition exists that can adversely affect the operation of the system. Because they are external, chassis faults are auto-clearing; when fault management detects that the external condition has returned to within normal parameters, it clears the fault. A fault is declared, however, and the chassis Service Action Required LEDs are lit because the external condition represents a potential hazard to the system. It is possible for an external fault to force a shutdown of the entire system.

Fault management detects the following chassis faults:

fault.temperature.high_warn@external/air_temp

  • Fault cause:

    • The external ambient air temperature exceeds 36oC (96.8oF).

  • Action in response to fault:

    • The chassis Service Action Required LEDs are lit.

    • The ILOM management interfaces are updated to reflect the fault.

    • The fault is recorded in the event log.

  • Fault clearing:

    • This external fault is automatically cleared when the ambient temperature falls below 36oC (96.8oF).

fault.temperature.high_shutdown@external/air_temp

  • Fault cause:

    • The external ambient air temperature exceeds 43oC (109.4oF).

  • Action in response to fault:

    • The ILOM management interfaces are updated to reflect the fault.

    • The fault is recorded in the event log.

    • The CMM notifies all SPs to force the blades to shut down. The hosts have two minutes in which to shut down gracefully; after two minutes the SPs force an immediate shutdown.

    • The chassis is powered off.

    • The CMM remains operational as long as the power supplies remain connected to AC power.

    • Note that the chassis Service Action Required LEDs were already lit when the fault.temperature.high_warn@external/air_temp fault was declared.

  • Fault clearing:

    • This external fault is automatically cleared when the ambient temperature falls below 43oC (109.4oF).

    • Note that the chassis Service Action Required LEDs are not extinguished until the temperature falls below the fault.temperature.high_warn@external/air_temp threshold.

fault.temperature.low_warn@external/air_temp

  • Fault cause:

    • The external ambient air temperature falls below 4oC (39.2oF).

  • Action in response to fault:

    • The chassis Service Action Required LEDs are lit.

    • The ILOM management interfaces are updated to reflect the fault.

    • The fault is recorded in the event log.

  • Fault clearing:

    • This external fault is automatically cleared when the ambient temperature rises above 4oC (39.2oF).

fault.temperature.low_shutdown@external/air_temp

  • Fault cause:

    • The external ambient air temperature falls below -2oC (28.4oF).

  • Action in response to fault:

    • The ILOM management interfaces are updated to reflect the fault.

    • The fault is recorded in the event log.

    • The CMM notifies all SPs to force the blades to shut down. The hosts have two minutes in which to shut down gracefully; after two minutes the SPs force an immediate shutdown.

    • The chassis is powered off.

    • The CMM remains operational as long as the power supplies remain connected to AC power.

    • Note that the chassis Service Action Required LEDs were already lit when the fault.temperature.low_warn@external/air_temp fault was declared.

  • Fault clearing:

    • This external fault is automatically cleared when the ambient temperature rises above -2oC (28.4oF).

    • Note that the chassis Service Action Required LEDs are not extinguished until the temperature rises above the fault.temperature.low_warn@external/air_temp threshold.