System Management Intel® 5000 Series Chipsets Server Board Family Datasheet
Revision 1.1
Intel order number D38960-004
118
4.14 Standard Fan Management
The BMC controls and monitors the system fans. For each fan, there is a fan speed sensor that
provides fan failure detection. Some platforms also provide fan presence detection which the
BMC maps into per-fan presence sensors. See the server or workstation Technical Product
Specification that applies to your product for more information.
It is possible for the BMC to control the speed of some fans. Controllable fans are divided into
fan domains in which there is a separate fan speed control for each domain and a separate fan
control policy configurable for each domain.
A fan domain can have a set of temperature and fan sensors associated with it. These sensors
are used to determine the current fan domain state. A fan domain has three states: sleep,
nominal, and boost. The sleep and boost states have fixed, but configurable, fan speeds
associated with them. The nominal state has a variable speed determined by the fan domain
policy (see section
4.14.1, Nominal Fan Speed). An OEM SDR record is used to configure the
fan domain policy (see Section
4.14.1).
Note: See the server or workstation Technical Product Specification that applies to your product
for more information
The fan domain state is controlled by several factors. The following states are in order of
precedence, from high to low:
Boost:
The associated fan in a critical or non-recoverable state in a non-redundant fan
configuration.
The fan domain is a state of insufficient resources in a redundant fan configuration.
Any temperature sensor in a critical or non-recoverable state, with the exception of
Processor Thermal Control Monitoring sensor (Prochot) or VRD Over-Temperature
(VRDHot) sensors.
Sleep:
No boost conditions, system in ACPI S1 and S3 sleep states, and the BMC is configured
to transition fan domains to sleep state.
Nominal:
See Section 4.14.1.
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