BMC Sensor Data | NVIDIA BlueField BMC Software

SDR Sensor List

The following is a list of the available sensors maintained by the BMC including their type and name.

Sensor Name	Sensor Type	Source	Description
`p0_link`	Discrete	IPMB	Uplink port 0 link status 0x100 – connection OK 0x200 – connection error
`p1_link`	Discrete	IPMB	Uplink port 1 link status 0x100 – connection OK 0x200 – connection error
`bluefield_temp`	Temperature	IPMB	NVIDIA® BlueField® temperature
`p0_temp`	Temperature	IPMB	Uplink port 0 SFP temperature
`p1_temp`	Temperature	IPMB	Uplink port 1 SFP temperature
`ddr_temp`	Temperature	IPMB	DDR temperature
`rtc_voltage`	Voltage	IPMB	RTC battery voltage
`power_envelope`	Power	IPMB	This sensor indicates the maximum power consumption allowed for BlueField-3 DPU This sensor is incompatible with secured Linux
`soc_power`	Power	IPMB	This sensor indicates the current power consumption of the BlueField-3 DPU This sensor is incompatible with secured Linux
`power_envelope_deviation`	Power	Synthesized Sensor	Measures the deviation of `soc_power` sensor value from `power_envelope` sensor value. `power_envelope_deviation = soc_power - power_envelope` The sensor value should be negative for normal conditions. If the sensor value is positive, then SoC power has exceeded the allowed power envelope. If the value of `soc_power` or `power_envelope` sensors is NaN, then the `power_envelope_deviation` sensor value will also be NaN.
`1V_BMC`	Voltage	BMC ADC
`1_2V_BMC`	Voltage	BMC ADC
`1_8V`	Voltage	BMC ADC
`1_8V_BMC`	Voltage	BMC ADC
`2_5V`	Voltage	BMC ADC
`3_3V`	Voltage	BMC ADC
`3_3V_RGM`	Voltage	BMC ADC
`5V`	Voltage	BMC ADC
`12V_ATX`	Voltage	BMC ADC	Input power rail from ATX (power from gold fingers in case of Sub75 when ATX power is off)
`12V_PCIe`	Voltage	BMC ADC	Input power rail from gold fingers
`DVDD`	Voltage	BMC ADC
`HVDD`	Voltage	BMC ADC
`VDD`	Voltage	BMC ADC
`VDDQ`	Voltage	BMC ADC
`VDD_CPU_L`	Voltage	BMC ADC
`VDD_CPU_R`	Voltage	BMC ADC

IPMB sourced sensors are supported when operating in DPU mode only.

Sensor Redfish Commands

Getting List of Support Sensors

BlueField sensors are stored within the Sensors schema under the Chassis schema. To retrieve the list of supported sensors, execute the following command:

curl -k -u root:'<password>' -H 'Content-Type: application/json' -X GET https://<bmc_ip>/redfish/v1/Chassis/Card1/Sensors

The following is an example of the anticipated output:

{
  "@odata.id": "/redfish/v1/Chassis/Card1/Sensors",
  "@odata.type": "#SensorCollection.SensorCollection",
  "Description": "Collection of Sensors for this Chassis",
  "Members": [
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/power_envelope"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/power_envelope_deviation"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/soc_power"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/bluefield_temp"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/ddr_temp"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/p0_temp"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/p1_temp"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/12V_ATX"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/12V_PCIe"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/1V_BMC"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/1_2V_BMC"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/1_8V"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/1_8V_BMC"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/2_5V"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/3_3V"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/3_3V_RGM"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/5V"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/DVDD"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/HVDD"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/VDD"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/VDDQ"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/VDD_CPU_L"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/VDD_CPU_R"
    },
    {
      "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/rtc_voltage"
    }
  ],
  "Members@odata.count": 24,
  "Name": "Sensors"
}

Getting Data for Specific Sensor

curl -k -u root:'<password>' -H 'Content-Type: application/json' -X GET https://<bmc_ip>/redfish/v1/Chassis/Card1/Sensors/<sensor_name>

The following is an example of a temperature sensor BlueField reading:

curl -k -u root:'<password>' -H 'Content-Type: application/json' -X GET https://<bmc_ip>/redfish/v1/Chassis/Card1/Sensors/bluefield_temp
{
  "@odata.id": "/redfish/v1/Chassis/Card1/Sensors/bluefield_temp",
  "@odata.type": "#Sensor.v1_2_0.Sensor",
  "Id": "bluefield_temp",
  "Name": "bluefield temp",
  "Reading": 43.0,
  "ReadingRangeMax": 255.0,
  "ReadingRangeMin": 0.0,
  "ReadingType": "Temperature",
  "ReadingUnits": "Cel",
  "RelatedItem": [
    {
      "@odata.id": "/redfish/v1/Systems/Bluefield"
    }
  ],
  "Status": {
    "Conditions": [],
    "Health": "OK",
    "HealthRollup": "OK",
    "State": "Enabled"
  },
  "Thresholds": {
    "LowerCaution": {
      "Reading": 5.0
    },
    "LowerCritical": {
      "Reading": 0.0
    },
    "UpperCaution": {
      "Reading": 95.0
    },
    "UpperCritical": {
      "Reading": 105.0
    }
  }
}

Configuring Sensor Thresholds

The following commands set the thresholds for sensors that support setting a threshold:

curl -k -u root:'<password>' -X PATCH https://<bmc_ip>/redfish/v1/Chassis/Card1/Sensors/<sensor name>/ -d '{"Thresholds":{"<Threshold name>": {"Reading":<value>}}}'

The following is an example of how to set the upper critical threshold for the BlueField temperature sensor:

curl -k -u root:'<password>' -X PATCH https://<bmc_ip>/redfish/v1/Chassis/Card1/Sensors/bluefield_temp -d '{"Thresholds":{"UpperCritical": {"Reading":100}}}'
{
  "@Message.ExtendedInfo": [
    {
      "@odata.type": "#Message.v1_1_1.Message",
      "Message": "The request completed successfully.",
      "MessageArgs": [],
      "MessageId": "Base.1.15.0.Success",
      "MessageSeverity": "OK",
      "Resolution": "None"
    }
  ]
}

Sensor IPMI Commands

BMC software supports reading chassis sensor information using the IPMItool.

The following subsections list commands which allow reading SDR data.

Displaying Sensor Data

Displays sensor data repository entry readings and their status.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sdr list

Displaying Extended Sensor Data

Displays extended sensor information.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sdr elist

Displaying Sensors and Thresholds

Displays sensors and thresholds in a wide table format.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sensor list

Displaying Sensor Data Records Specified by Sensor ID

Displays sensor data records specified by sensor ID.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sdr get <name>

Displaying All Records from SDR Repository of Specific Type

Displays all records from the SDR repository of a specific type.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sdr type <type>

Displaying Data for Sensors Specified by Name

Displays information for sensors specified by name.

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sensor get <sensor_name>

Displaying Readings for Sensors Specified by Name (Only for Numeric Sensors)

ipmitool -C 17 -I lanplus -H <bmc_ip> -U ADMIN -P ADMIN sensor reading <name>…<name>

Last updated: May 27, 2026