Standard Fan Management - Intel S2600WF Technical Product Specification

Intel® Server Board S2600WF Product Family Technical Product Specification
For analog/threshold sensors, with the exception of processor temperature sensors, critical and non-critical
thresholds (upper and lower) are set through SDRs and event generation enabled for both assertion and de-
assertion events.
For discrete sensors, both assertion and de-assertion event generation are enabled.
Mandatory monitoring of platform thermal sensors includes:
• Inlet temperature (physical sensor is typically on system front panel or HDD back plane),
Board ambient thermal sensors,
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Processor temperature,
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• Memory (DIMM) temperature,
CPU voltage regulator down (VRD) hot monitoring, and
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Power supply unit (PSU) inlet temperature (only supported for PMBus*-compliant PSUs).
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Additionally, the BMC firmware may create virtual sensors that are based on a combination or aggregation of
multiple physical thermal sensors and the application of a mathematical formula to thermal or power sensor
readings.
12.3.3

Standard Fan Management

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: sleep, boost, and nominal. 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. The factors for the boost state are listed below in order
of precedence, high to low. If any of these conditions apply, the fans are set to a fixed boost state speed.
An associated fan is in a critical state or missing. The SDR describes which fan domains are boosted in
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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.
• Any associated temperature sensor is in a critical state. The SDR describes which temperature-thresh-
old violations cause fan boost for each fan domain.
• The BMC is in firmware update mode, or the operational firmware is corrupted.
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.
12.3.3.1 Hot-Swappable Fans
Hot-swappable fans, which can be removed and replaced while the system is powered on and operating, are
supported. The BMC implements fan presence sensors for each hot-swappable fan.
When a fan is not present, the associated fan speed sensor is put into the reading/unavailable state, and any
associated fan domains are put into the boost state. The fans may already be boosted due to a previous fan
failure or fan removal.
When a removed fan is inserted, the associated fan speed sensor is re-armed. 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 re-arms the fan speed sensors and clears fan failure conditions. If the failure condition
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