Intel® Server System R2000WF Product Family Technical Product Specification
59
The power supply is protected against over temperature conditions caused by excessive ambient
temperature. In an over-temperature protection condition, the power supply module shuts down.
Should system thermals increase to a point beyond the maximum thermal limits, the system shuts down, the
system status LED changes to solid amber, and the event is logged to the system event log. Should power
supply thermals increase to a point beyond their maximum thermal limits or if a power supply fan should fail,
the power supply shuts down.
Note
: For proper system thermal management, Sensor Data Records (SDRs) for any given system
configuration must be loaded by the system integrator as part of the initial system integration process. SDRs
are loaded using the FRUSDR utility which is part of the System Update Package (SUP) or One-boot Firmware
Update (OFU) package which can be downloaded from
http://downloadcenter.intel.com
4.2.1
Fan Speed Control
The BMC controls and monitors the system fans. Each fan is associated with a fan speed sensor that detects
fan failure and may also be associated with a fan presence sensor for hot-swap support. For redundant fan
configurations, the fan failure and presence status determines the fan redundancy sensor state.
The system fans are divided into fan domains, each of which has a separate fan speed control signal and a
separate configurable fan control policy. A fan domain can have a set of temperature and fan sensors
associated with it. These are used to determine the current fan domain state.
A fan domain has three states:
The sleep and boost states have fixed (but configurable through OEM SDRs) fan speeds associated
with them.
The nominal state has a variable speed determined by the fan domain policy. An OEM SDR record is
used to configure the fan domain policy.
The fan domain state is controlled by several factors. They are listed below in order of precedence, high to
low:
Boost – if any of the below conditions apply, the fans are set to a fixed boost state speed
o
Associated fan is in a critical state or missing. The SDR describes which fan domains are
boosted in response to a fan failure or removal in each domain. If a fan is removed when the
system is in ‘Fans-off’ mode it is not detected and there is not any fan boost until the system
comes out of ‘Fans-off; mode.
o
Any associated temperature sensor is in a critical state. The SDR describes which temperature
threshold violations cause fan boost for each fan domain.
o
The BMC is in firmware update mode or the operational firmware is corrupted.
Nominal
o
A fan domain’s nominal fan speed can be configured as static (fixed value) or controlled by the
state of one or more associated temperature sensors.
4.2.1.1
Programmable Fan PWM Offset
The system provides a BIOS setup option to boost the system fan speed by a programmable positive offset
or a Max setting. Setting the programmable offset causes the BMC to add the offset to the fan speeds to
which it would otherwise be driving the fans. The Max setting causes the BMC to replace the domain
minimum speed with alternate domain minimums that also are programmable through SDRs.
This capability is offered to provide system administrators the option to manually configure fan speeds in
instances where the fan speed optimized for a given platform may not be sufficient when a high end add-in
