Intel® Server Board S2600CP and Intel® Server System P4000CP Platform Management
Intel
®
Server Board S2600CP and Server System P4000CP TPS
Revision 1.1
Intel order number G26942-003
68
6.3.6 Thermal Sensor Input to Fan Speed Control
The BMC uses various IPMI sensors as input to the fan speed control. Some of the sensors are
IPMI models of actual physical sensors whereas some are “virtual” sensors whose values are
derived from physical sensors using calculations and/or tabular information.
The following IPMI thermal sensors are used as input to the fan speed control:
Front panel temperature sensor
Baseboard temperature sensors
CPU DTS-Spec margin sensors
DIMM thermal margin sensors
Exit air temperature sensor
Global aggregate thermal margin sensors
PCH temperature sensor
On-board Ethernet controller temperature sensors (support for this is specific to the
Ethernet controller being used)
Add-in Intel SAS/IO module temperature sensor(s) (if present)
Power supply thermal sensors (only available on PMBus-compliant power supplies).
A simple model is shown in the following figure which gives a high level graphic of the fan speed
control structure creates the resulting fan speeds.
Figure 29. High-level Fan Speed Control Process
6.3.7 Power Supply Status\Health Sensors
The BMC supports one Power Supply Status sensor for each system power supply module. In
order to track problems in which the PSU firmware is not operating to full capacity, an additional
case (degraded condition if the PSU firmware is not operating to full capacity) is added to the
existing Power Supply Status sensor offset definitions. This is handled by assertion of the
“configuration error” offset of the PSU status sensor. These sensors are only supported for
systems that use PMBus-compliant power supplies.
IPMI Sensor Characteristics
a. Event reading type code: 6Fh (Sensor Specific)
b. Event sensor type code: 08h (Power Supply)
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