Intel Server Board S2400BB

Intel® Server Board S2400BB TPS

Revision 2.0

6.8 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 (approx 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).

Events logged to the SEL can be viewed using Intel’s SELVIEW utility, Embedded Web Server, and Active

System Console.

6.9 System Fan Management

The BMC controls and monitors the system fans. Each fan is associated with a fan speed sensor that detects a

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

6.9.1 Thermal and Acoustic Management

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.

This capability requires the BMC to access temperature sensors on the individual memory DIMMs.

Additionally, closed-loop thermal throttling is only supported with buffered DIMMs.

In order to maintain comprehensive thermal protection, deliver the best system acoustics, and fan power

efficiency, an intelligent Fan Speed Control (FSC) and thermal management technology (mechanism) is used.

Options in <F2> BIOS Setup (BIOS > Advanced > System Acoustic and Performance Configuration) allow

for parameter adjustments based on the actual system configuration and usage. Refer to System Acoustic and

Performance Configuration for a description of each setting.

 Set Throttling Mode

 Altitude

 Set Fan Profile

 Fan PWM Offset

 Quiet Fan Idle Mode