Specifications

B
IPMI Commands and Managed Sensors
95
Managed sensors
OntheCPM,theIPMCsensorsmonitorvoltages,temperatures,controlsignals,andstatus
events.Forfunctionalinformation,refertoIPMIcontrolleronpage 33.Thesensorsare
describedinTable 38.
Types of sensors
TheCPMimplementsthefollowingtypesofsensors.
•Discrete—Adiscretesensorcanhaveupto16bitmappedstates,withonestateastrue.
• Digital—Adigitalsensorhastwopossiblestates,onlyoneofwhichcanbeactiveatany
giventime.Forexample,adigitalsensormonitoringthepowermayindicatewhetherthe
powerisgoodornotgood.
•OEM—AnOEMsensorhasitsstatesdefinedbythemanufacturer.Thereadingtypesof
thesesensorsaresometimesdefinedas“sensor‐specific.”
• Threshold—Athresholdsensorhasarangeof256values,whichrepresent
measurementsontheCPManditsFRUs.Temperature,voltage,current,andfanspeed
sensorsareexamplesofthresholdsensors.Table 37liststhepossiblethresholdtypesfor
themanagedsensors.
Note:IftheCPMexceedsoneoftheUNRthresholds,theShelfManagergeneratesacritical
alarmandshutsdowntheCPM.Seethe
SoftwareGuidefordetails.
Table 37. Threshold types
Threshold type Description
UNR Upper non-recoverable thresholds generate a critical alarm on the high side.
UC Upper critical thresholds generate a major alarm on the high side.
UNC Upper non-critical thresholds generate a minor alarm on the high side.
LNC Lower non-critical thresholds generate a minor alarm on the low side.
LC Lower critical thresholds generate a major alarm on the low side.
LNR Lower non-recoverable thresholds typically generate a critical alarm on the low side.