System Event Log (Sel); 6.11 System Fan Management; Thermal And Acoustic Management - Intel S1400SP Technical Manual

Intel® Server Board S1400SP TPS Platform Management Functional Overview
The BMC provides FRU device command access to its own FRU device and to the FRU
devices throughout the server. The FRU device ID mapping is defined in the Platform Specific
Information. The BMC controls the mapping of the FRU device ID to the physical device

6.10 System Event Log (SEL)

The BMC implements the system event log as specified in the Intelligent Platform Management
Interface Specification, Version 2.0. The SEL is accessible regardless of the system power state
through the BMC's in-band and out-of-band interfaces.
The BMC allocates 65,502 bytes (approximately 64 KB) of non-volatile storage space to store
system events. The SEL timestamps may not be in order. Up to 3,639 SEL records can be
stored at a time. Any command that results in an overflow of the SEL beyond the allocated
space is rejected with an "Out of Space" IPMI completion code (C4h).
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Events logged to the SEL can be viewed using Intel 's SELVIEW utility, Embedded Web Server,
and Active System Console.

6.11 System 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, nominal, and boost. 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.
System fan speeds are controlled through pulse width modulation (PWM) signals, which are
driven separately for each domain by integrated PWM hardware. Fan speed is changed by
adjusting the duty cycle, which is the percentage of time the signal is driven high in each pulse
6.11.1

Thermal and Acoustic Management

The S1400SP offers multiple thermal and acoustic management features to maintain
comprehensive thermal protection as well as intelligent fan speed control. The features can be
adjusted in BIOS interface with path BIOS > Advanced > System Acoustic and Performance
Configuration.
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, BMC, and
SDRs work together to provide control over how this trade-off is determined.
Revision 2.1 Intel order number G64248-003 55