Margin Sensors; Ipmi Watchdog Sensor; Bmc Watchdog Sensor; Bmc System Management Health Monitoring - Intel S2600KPFR Product Specifications

Technical Product Specification
9.3.4

Margin Sensors

There is sometimes a need for an IPMI sensor to report the difference (margin) from a non-
zero reference offset. For the purposes of this document, these type sensors are referred to as
margin sensors. For instance, for the case of a temperature margin sensor, if the reference
value is 90 degrees and the actual temperature of the device being monitored is 85 degrees,
the margin value would be -5.
9.3.5

IPMI Watchdog Sensor

The BMC supports a Watchdog Sensor as a means to log SEL events due to expirations of the
IPMI 2.0 compliant Watchdog Timer.
9.3.6

BMC Watchdog Sensor

The BMC supports an IPMI sensor to report that a BMC reset has occurred due to action taken
by the BMC Watchdog feature. A SEL event will be logged whenever either the BMC firmware
stack is reset or the BMC CPU itself is reset.
9.3.7

BMC System Management Health Monitoring

The BMC tracks the health of each of its IPMI sensors and reports failures by providing a "BMC
FW Health" sensor of the IPMI 2.0 sensor type Management Subsystem Health with support
for the Sensor Failure offset. Only assertions should be logged into the SEL for the Sensor
Failure offset. The BMC Firmware Health sensor asserts for any sensor when 10 consecutive
sensor errors are read. These are not standard sensor events (that is, threshold crossings or
discrete assertions). These are BMC Hardware Access Layer (HAL) errors. If a successful sensor
read is completed, the counter resets to zero.
9.3.8

VR Watchdog Timer

The BMC firmware monitors that the power sequence for the board VR controllers is
completed when a DC power-on is initiated. Incompletion of the sequence indicates a board
problem, in which case the firmware powers down the system.
The BMC firmware supports a discrete IPMI sensor for reporting and logging this fault
condition.
9.3.9

System Airflow Monitoring

This sensor is only valid in Intel chassis. The BMC provides an IPMI sensor to report the
volumetric system airflow in CFM (cubic feet per minute). The air flow 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.
Revision 1.37
Platform Management
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