Intel® Server System Server System "Emerald Ridge ... - CTL

錯 誤 ! 尚 未 定 義 樣 式 。錯 誤 ! 尚 未 定 義 樣 式 。 EPS3.28.2 Power Supply Fan MonitoringIn addition to the system fan monitoring supported the BMC monitors the power supply fans.These are monitored primarily to support power supply failure management as described insection 3.28.4. The BMC FW supports one PS Fan Fault sensor per power supply fan.Monitoring is implemented via IPMI discrete sensors, one for each power supply fan. The BMCpolls each installed power supply using the PBMus fan status commands to check for failureconditions for the power supply fans. The BMC asserts the “performance lags” offset of the IPMIsensor if a fan failure is detected.Power supply fan sensors are implemented as manual re-arm sensors because a failurecondition can result in boosting of the fans. This in turn may cause a failing fan’s speed to riseabove the “fault” threshold and can result in fan oscillations. As a result, these sensors do notauto-rearm when the fault condition goes away but rather are rearmed only when the system isreset or power-cycled.After the sensor is rearmed, if the fan is no longer showing a failed state, the failure condition inthe IPMI sensor shall be cleared and a deassertion event shall be logged.IPMI Sensor Characteristics Event reading type code: 03h (Generic – digital discrete) Sensor type code: 04h (Fan) Rearm type: ManualTable 15. Supported Sensor OffsetsOffsetDescriptionEvent Logging01h State asserted Assertion and deassertion46Intel ConfidentialRevision 1.1