R1000GZ and R1000GL
Intel
®
Server System R1000GZ/GL Product Family TPS
3.8.3 BMC Requirements
The BMC uses the Cold_Redundancy_Config command to define/configure the power supply’s roll in cold
redundancy and to turn on/off cold redundancy.
The BMC shall schedule a rolling change for which PSU is the Active, Cold Stby1, Cold Stby 2, and Cold Stby
3 power supply. This allows for equal loading across power supply over their life.
Events that trigger a re-configuration of the power supplies using the Cold_Redundancy_Config command.
o AC power ON
o PSON power ON
o Power Supply Failure
o Power supply inserted into system
3.8.4 Power Supply Turn On Function
Powering on and off of the cold standby power supplies is only controlled by each PSU sensing the Vshare bus.
Once a power supply turns on after crossing the enable threshold; it lowers its threshold to the disable
threshold. The system defines the ‘position’ of each power supply in the Cold Redundant operation. It will do
this each time the system is powered on, a power supply fails, or a power supply is added to the system.
The system is relied upon to tell each power supply where it resides in the Cold Redundancy scheme.
3.9 Closed Loop System Throttling (CLST)
The server system has support for Closed Loop System Throttling (CLST). CLST prevents the system from
crashing if a power supply module is overloaded. Should system power reach a pre-programmed power limit,
CLST will throttle system memory and/or processors to reduce power. System performance will be impacted
should this occur. For more in depth information about CLST implementation, please refer to the SmaRT &
CLST Architecture on “Romley” Systems and Power Supplies Specification (IBL Reference # 461024).
3.10 Smart Ride Through (SmaRT)
The server system has support for Smart Ride Through Throttling (SmaRT). This feature increases the
reliability for a system operating in a heavy power load condition, to remain operational during an AC line
dropout event. See section 3.5.4 AC Line Dropout / Holdup for power supply hold up time requirements for AC
Line dropout events.
When AC voltage is too low, a fast AC loss detection circuit inside each installed power supply asserts an
SMBALERT# signal to initiate a throttle condition in the system. System throttling reduces the bandwidth to
both system memory and CPUs, which in turn reduces the power load during the AC line drop out event.
3.11 Power Supply Status LED
There is a single bi-color LED to indicate power supply status.
The LED operation is defined in the following
table.
Table 20. LED Indicators
Power Supply Condition
LED State
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