Intel® Server System S7000FC4UR TPS BMC Functional Specifications
Revision 1.0
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When a removed fan is inserted, the associated fan speed sensor is rearmed. If there are no
other critical conditions causing a fan boost condition, the fan speed returns to the nominal
state. Power-cycling or resetting the system rearms the fan speed sensors and clears fan failure
conditions. If the failure condition is still present, the boost state returns once the sensor has
reinitialized and the threshold violation is detected again.
22.16.2 Sleep State Fan Control
Using the Set ACPI Configuration Mode command, the BMC may be configured to set the fans
to a fixed sleep state speed when the system is in the S1 sleep state.
22.16.3 Fan Redundancy Detection
The BMC supports redundant fan monitoring and implements a fan redundancy sensor. A fan
redundancy sensor generates events when its associated set of fans transitions between
redundant and non-redundant states, as determined by the number and health of the fans. The
definition of fan redundancy is configuration dependent. The BMC allows redundancy to be
configured on a per fan-redundancy sensor basis via OEM SDR records.
A fan failure, or removal of hot-swap fans up to the number of redundant fans specified in the
SDR, in a fan configuration is a non-critical failure and is reflected in the front panel status as
such. A fan failure or removal that exceeds the number of redundant fans is a non-fatal
insufficient resources condition and is reflected in the front panel status as a non-fatal error.
22.16.4 Fan Domains
System fan speeds are controlled through pulse width modulation (PWM) signals, which are
driven separately for each domain by auxiliary system management devices. Fan speed is
changed by adjusting the duty-cycle, which is the percentage of time the signal is driven high in
each pulse.
22.16.5 Nominal Fan Speed
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.
OEM SDR records are used to configure which temperature sensors are associated with which
fan control domains and the algorithmic relationship between the temperature and fan speed.
Multiple OEM SDRs can reference / control the same fan control domain, and multiple OEM
SDRs can reference the same temperature sensors.
22.17 Acoustic Management (Acoustic Monitoring)
This feature refers to enhanced fan management to keep the system optimally cooled while
reducing the amount of noise generated by the system fans. Aggressive acoustics standards
might require a trade-off between fan speed and system performance parameters that
contribute to the cooling requirements, primarily memory bandwidth. The BIOS, the BMC, and
the SDRs work together to provide control over how this trade-off is determined.
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