Intel S2600GZ S2600GZ/GL - Page 71

Platform Management Functional Overview Intel® Server Board S2600GZ/GL TPS 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 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 Note: The above features may or may not be in effective depends on the actual thermal characters of a specific system. Refer to Intel® Server System R1000GZ/GL product family Technical Product Specification and Intel® Server System R2000GZ/GL product family Technical Product Specification for system thermal and acoustic management. 6.9.2 Thermal Sensor Input to Fan Speed Control The BMC uses various IPMI sensors as input to the fan speed control. Some of the sensors are IPMI models of actual physical sensors whereas some are "virtual" sensors whose values are derived from physical sensors using calculations and/or tabular information. The following IPMI thermal sensors are used as input to the fan speed control:  Front Panel Temperature Sensor1  Baseboard Temperature Sensor2  CPU Margin Sensors3,5,6  DIMM Thermal Margin Sensors3,5  Exit Air Temperature Sensor1, 4, 8  PCH Temperature Sensor4,6 58 Revision 1.1 Intel order number G24881-004