IntelÃ‚Â® Server System Server System "Emerald Ridge ... - CTL

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錯誤 ! 尚未定義樣式。 EPSFunctional SpecificationThe sum of calculated contributions of all Clamp Tcontrol sub-records that are valid under theactive profile for that domain is added to the maximum of valid stepwise linear contributions.3.16.4.3 Sensor FailureEach Tcontrol SDR sub-record has a failure control value field. The value in this field is used bythe BMC as that sub-record’s fan speed contribution if the associated sensor is enabled but ismarked reading/state unavailable. If the sensor is unreadable because it is disabled, or if afailure control value of FFh is specified, then the BMC ignores the sub-record’s fan speedcontribution.3.16.5 Thermal and Acoustic ManagementThis feature refers to enhanced fan management to keep the system optimally cooled whilereducing the amount of noise generated by the system fans. Aggressive acoustics standardsmight require a trade-off between fan speed and system performance parameters thatcontribute to the cooling requirements, primarily memory bandwidth. The BIOS, BMC, andSDRs work together to provide control over this trade-off determination.This capability requires the BMC to access temperature sensors on the individual memoryDIMMs. Emerald Ridge only supports RDIMMs.3.16.5.1 Fan Profiles.The server system supports multiple fan control profiles to support acoustic targets andASHRAE compliance. Fan profile will be selected based on the altitude setting. The BIOS Setuputility can be used to configure the correct altitude settingAlthough there are up to eight profiles available, the Emerald Ridge implementation supportsonly five profiles. There is one profile associated with each of four altitude settings. The fouraltitude settings are: 1) less than 300m, 2) between 301m and 900m, 3) between 901 and1500m, greater than 1501m. Additionally, a default profile is defined which the BMC appliesupon system power on until BIOS changes the enabled profile after system boot. This defaultprofile excludes all fan control based on DIMM and Memory Buffer temperature sensors andmust be configured to provide sufficient cooling capability under this constraint. If for any reason,the BMC cannot determine which primary profile to use, the BMC should be set to the defaultprofile.Table 12. Fan Profile MappingTypeProfileDefault 0 DefaultCLTT 1 less than 300m altitudeCLTT 2 between 301m and 900m,CLTT 3 between 901 and 1500mCLTT 4 greater than 1501mDetailsThe BMC provides commands that query for fan profile support and it provides a way to enablea fan profile. Enabling a fan profile determines which TControl SDRs are used for fanmanagement. The BMC only supports enabling a fan profile through the command if that profileis supported on all fan domains defined for the system. It is important to configure the SDRs soRevision 1.1Intel ® Confidential 33
錯誤 ! 尚未定義樣式。錯誤 ! 尚未定義樣式。 EPSthat all desired fan profiles are supported on each fan domain. If no single profile is supportedacross all domains, the BMC defaults to using profile 0 and do not allow it to be changed.At system boot, the BIOS can use the Get Fan Control Configuration command to query theBMC about which fan profiles are supported. The BIOS uses this information to display optionsin the BIOS Setup utility. The BIOS indicates the fan profile to the BMC, as dictated by the BIOSSetup Utility options for altitude, using the Set Fan Control Configuration command.The BMC uses this information as input to its fan control algorithm as supported by the TControlOEM SDR. The BMC only allows enabling fan profiles that the BMC indicates are supportedusing the Get Fan Control Configuration command. For example, if the Get Fan ControlConfiguration command indicates that only profile 1 is supported, then using the Set FanControl Configuration command to enable profile 2 will result in the return of an error completioncode.The BMC requires the BIOS to send the Set Fan Control Configuration command to the BMC onevery system boot. This must be done after BIOS has completed any throttling-related chipsetconfiguration.3.16.5.2 ASHRAE ComplianceSystem requirements for ASHRAE compliance is defined in the Common Fan Speed Control &Thermal Management Platform Architecture Specification. Altitude-related changes in fan speedcontrol are handled through profiles for different altitude ranges.3.17 DIMM Thermal Margin SensorEmerald Ridge platform supports system memory DIMMs with temperature sensing capabilities.DIMMs without temperature sensor are not supported. This section describes how thetemperature readings from the DIMMs are modeled as IPMI sensors.SDRs for these aggregate sensors should be set to “sensor scanning disabled” state and thatenabling/disabling of the sensors occurs by the BMC FW when BIOS updates DIMM map using“Set Fan Control Configuration” command.3.17.1.1 Discovery of Physical DIMM Temperature SensorsThe BIOS provides Physical DIMM presence information to the BMC using an IPMI command“Set Fan Control Configuration” during POST at each system boot as part of BIOS configurationof the BMC fan settings.During Memory Hot Plug and Memory Online/Offline operation BIOS must update BMCregarding new DIMM presence map.The temperature readings from the physical temperature sensors on each DIMM areaggregated into IPMI temperature margin sensors for each for memory risers 1&2, 3&4, 5&6,and 7&8 corresponding to CPU group 0,1,2,3.Each DIMM can potentially have a different nominal thermal operating range depending on themanufacturer, memory refresh rate, and other factors. Taking these factors into account, BIOS34Intel ConfidentialRevision 1.1
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