Relion 1900e/2900e Manual
77
Revision 1.3
BIOS and BMC will handshake to automatically understand configuration details and automatically select the
optimal fan speed control profile in the BMC. Customers will only select a performance or an acoustic profile
selection from the BIOS menu for EPSD system and the fan speed control will be optimal for the
configuration loaded.
Users can still choose performance or acoustic profile in BIOS setting. Default is acoustic. Performance
option is recommend if customer installed MICs or any other high power add-in cards (higher than 75W) or
PCI-e add-in cards which requires excessive cooling.
7.3.14.6.6
ASHRAE Compliance
Auto-profile algorithm will be implemented for PCSD products from Grantley generation. There will be no
manual selection of profiles at different altitudes, but altitude impact will be well covered by auto-profile.
7.3.14.7
Power Supply Fan Speed Control
This section describes the system level control of the fans internal to the power supply over the PMBus*.
Some, but not all, Intel® Server Systems supporting the Intel® Xeon® processor E5-2600 v3, v4 product
family will require that the power supplies be included in the system level fan speed control. For any system
that requires either of these capabilities, the power supply must be PMBus*-compliant.
7.3.14.7.1
System Control of Power Supply Fans
Some products require that the BMC control the speed of the power supply fans, as is done with normal
system (chassis) fans, except that the BMC cannot reduce the power supply fan any lower than the internal
power supply control is driving it. For these products the BMC FW must have the ability to control and
monitor the power supply fans through PMBus* commands. The power supply fans are treated as a system
fan domain for which fan control policies are mapped, just as for chassis system fans, with system thermal
sensors (rather than internal power supply thermal sensors) used as the input to a clamp algorithm for the
power supply fan control. This domain has both piecewise clipping curves and clamped sensors mapped into
the power supply fan domain. All the power supplies can be defined as a single fan domain.
7.3.14.7.2
Use of Power Supply Thermal Sensors as Input to System (Chassis) Fan Control
Some products require that the power supply internal thermal sensors are used as control inputs to the
system (chassis) fans, in the same manner as other system thermal sensors are used for this purpose. The
power supply thermal sensors are included as clamped sensors into one or more system fan domains, which
may include the power supply fan domain.
7.3.14.8
Fan Boosting due to Fan Failures
Intel
®
Server Systems supporting the Intel® Xeon® processor E5-2600 v3, v4 product family introduce
additional capabilities for handling fan failure or removal as described in this section.
Each fan failure shall be able to define a unique response from all other fan domains. An OEM SDR table
defines the response of each fan domain based on a failure of any fan, including both system and power
supply fans (for PMBus*-compliant power supplies only). This means that if a system has six fans, then there
will be six different fan fail reactions.
7.3.14.9
Programmable Fan PWM Offset
The system provides a BIOS Setup option to boost the system fan speed by a programmable positive offset
or a “Max” setting. Setting the programmable offset causes the BMC to add the offset to the fan speeds to
which it would otherwise be driving the fans. The Max setting causes the BMC to replace the domain
minimum speed with alternate domain minimums that also are programmable through SDRs.
This capability is offered to provide system administrators the option to manually configure fan speeds in
instances where the fan speed optimized for a given platform may not be sufficient when a high end add-in
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