Intel S2600CW - System Airflow Monitoring; Thermal Monitoring

Intel® Server Board S2600CW Platform Management Intel® Server Board S2600CW Family TPS
68 Revision 2.4
5.3.9 System Airflow Monitoring
The sensor is valid only for Intel server chassis. BMC provides an IPMI sensor to report the
volumetric system airflow in CFM (cubic feet per minute). The airflow in CFM is calculated
based on the system fan PWM values. The specific Pulse Width Modulation (PWM or PWMs)
used to determine the CFM is SDR configurable. The relationship between PWM and CFM is
based on a lookup table in an OEM SDR.
The airflow data is used in the calculation for exit air temperature monitoring. It is exposed as
an IPMI sensor to allow a datacenter management application to access this data for use in
rack-level thermal management.
5.3.10 Thermal Monitoring
The BMC provides monitoring of component and board temperature sensing devices. This
monitoring capability is instantiated in the form of IPMI analog/threshold or discrete sensors,
depending on the nature of the measurement.
For analog/threshold sensors, with the exception of Processor Temperature sensors, critical
and non-critical thresholds (upper and lower) are set through SDRs and event generation
enabled for both assertion and de-assertion events.
For discrete sensors, both assertion and de-assertion event generation are enabled.
Mandatory monitoring of platform thermal sensors includes:
 Inlet temperature (physical sensor is typically on system front panel or HDD backplane)
 Board ambient thermal sensors
 Processor temperature
 Memory (DIMM) temperature
 CPU VRD Hot monitoring
 Power supply Inlet temperature (only supported for PMBus*-compliant PSUs)
Additionally, the BMC FW may create “virtual” sensors that are based on a combination of
aggregation of multiple physical thermal sensors and application of a mathematical formula to
thermal or power sensor readings.
5.3.10.1 Absolute Value versus Margin Sensors
Thermal monitoring sensors fall into three basic categories:
 Absolute temperature sensors – These are analog/threshold sensors that provide a
value that corresponds to an absolute temperature value.
 Thermal margin sensors – These are analog/threshold sensors that provide a value
that is relative to a reference value.