System Event Log Troubleshooting Guide for EPSD
Platforms Based on Intel
®
Xeon
®
Processor E5 4600/2600/2400/1600/1400 Product Families
Cooling Subsystem
Revision 1.1 Intel order number G90620-002 51
5.2.2 Thermal Margin Sensors
Margin sensors are also linear sensors but typically report a negative value. This is not an actual temperature, but in fact an offset to
a critical temperature. Values reported are seen as number of degrees below a critical temperature for the particular component.
The BMC supports DIMM aggregate temperature margin IPMI sensors. The temperature readings from the physical temperature
sensors on each DIMM (such as, Temperature Sensor on DIMM, or TSOD) are aggregated into IPMI temperature margin sensors for
groupings of DIMM slots, the partitioning of which is platform/SKU specific and generally corresponding to fan domains.
The BMC supports global aggregate temperature margin IPMI sensors. There may be as many unique global aggregate sensors as
there are fan domains. Each sensor aggregates the readings of multiple other IPMI temperature sensors supported by the BMC FW.
The mapping of child-sensors into each global aggregate sensor is SDR-configurable. The primary usage for these sensors is to
trigger turning off fans when a lower threshold is reached.
Table 38: Thermal Margin Sensors Typical Characteristics
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