Reducing power consumption of a redundant power system utilizing sleep power consumption considerations for power supply units within the redundant power system
A method, system, and information handling system provides better system power consumption of a redundant power system having a plurality of power supply units (PSUs) by taking into consideration each PSU's sleep power consumption during selection of one or more PSUs to place into a “hot spare” sleep mode. For each PSU, power efficiency data at different load ratings are measured and stored. During the PSU selection, a calculation of system power consumption is conducted on each of several configurations where a different PSU is hypothetically disabled. Each calculation takes into consideration both the sleep power consumption of a disabled PSU and power efficiency data of an enabled PSU. Selection of one or more PSUs to disable is determined according to the configuration yielding the lower or lowest system input power consumption based on the results of the calculations.
1. A method of reducing power consumption of a redundant power system (RPS) having a plurality of power supply units (PSUs) to supply power to a load, the method comprising:
a PSU selector receiving operational data for each PSU, including a current load rating, efficiency data for a set of load ratings, and sleep power consumption data;
computing a system power consumption for each of a plurality of configurations, where at least one different PSU is hypothetically disabled from supplying power while each remaining PSU is hypothetically enabled to supply power required for the load, each computation taking into consideration the sleep power consumption data of the hypothetically disabled at least one PSU;
comparing a resulting plurality of computed system power consumptions to identify which specific configuration of the plurality of configurations yields a lowest system power consumption; and
in response to a determination that system power consumption can be reduced by implementing the specific configuration while providing a required supply power to the load, the PSU selector implementing the specific configuration of the PSUs within the RPS, wherein the at least one PSU is disabled, while the remaining PSUs are enabled.
2. The method of claim 1 , further comprising triggering the computing and comparing processes in response to detection of a hot spare condition within the RPS, wherein the specific configuration is implemented while a present operating condition of the RPS remains the hot spare condition.
3. The method of claim 1 , wherein implementing the specific configuration comprises:
disabling the at least one PSU from supplying power, wherein disabling the at least one PSU from supplying power places the at least one PSU into a sleep mode during which the PSU is held in readiness to supply power when required; and
enabling the remaining at least one PSU to supply power required for the load.
4. The method of claim 1 , wherein the RPS comprises a first PSU and a second PSU, and wherein the computing of a system power consumption for each of a plurality of configurations comprises:
computing a first system power consumption for a first configuration in which the first PSU is hypothetically disabled from supplying power and the second PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the first PSU; and
computing a second system power consumption for a second configuration in which the second PSU is hypothetically disabled from supplying power and the first PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the second PSU.
5. The method of claim 4 , wherein the computing of the system power consumption further comprises performing the computation with consideration of an efficiency value of the hypothetically enabled one of the first PSU and the second PSU at a combined load level for that hypothetically enabled PSU reflecting the combined load of the first PSU and the second PSU.
6. The method of claim 5 , wherein the computing of system power consumptions further comprises:
deriving the combined load level for the hypothetically enabled one of the first PSU and the second PSU based on the received data indicating a respective current load rating of each of the first PSU and the second PSU and the respective efficiency data of the first PSU and the second PSU; and
calculating the efficiency value of the hypothetically enabled PSU at the combined load level based on the respective efficiency data of the first and second PSUs.
7. A system for reducing power consumption, the system comprising:
a redundant power system having a plurality of power supply units (PSUs) supplying power to a load; and
a PSU selector communicatively coupled to at least two of the plurality of the PSUs, and configured to selectively disable at least one PSU from the plurality of PSUs in order to reduce system power consumption in connection with supplying power to the load, wherein the PSU selector:
receives operational data for each PSU, including a current load rating, efficiency data for a set of load ratings, and sleep power consumption data;
computes a system power consumption for each of a plurality of configurations, where at least one different PSU is hypothetically disabled from supplying power while each remaining PSU is hypothetically enabled to supply power required for the load, each computation taking into consideration the sleep power consumption data of the hypothetically disabled at least one PSU;
compares a resulting plurality of computed system power consumptions to identify which specific configuration of the plurality of configurations yields a lowest system power consumption; and
in response to a determination that system power consumption can be reduced by implementing the specific configuration while providing a required supply power to the load, implements the specific configuration of the PSUs within the RPS, wherein the at least one PSU is disabled, while the remaining PSUs are enabled.
8. The system of claim 7 , wherein the PSU selector performs the computing and comparing processes in response to detection of a hot spare condition within the RPS, wherein the specific configuration is implemented while a present operating condition of the RPS remains the hot spare condition.
9. The system of claim 7 , wherein to implement the specific configuration, the PSU selector:
disables the at least one PSU from supplying power, wherein disabling the at least one PSU from supplying power places the at least one PSU into a sleep mode during which the PSU is held in readiness to supply power when required; and
enables the remaining at least one PSU to supply power required for the load.
10. The system of claim 7 , wherein the RPS comprises a first PSU and a second PSU, and wherein to compute the system power consumption for each of a plurality of configurations, the PSU selector:
computes a first system power consumption for a first configuration in which the first PSU is hypothetically disabled from supplying power and the second PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the first PSU; and
computes a second system power consumption for a second configuration in which the second PSU is hypothetically disabled from supplying power and the first PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the second PSU.
11. The system of claim 10 , wherein in computing the system power consumptions the PSU selector performs the computation with consideration of an efficiency value of the hypothetically enabled one of the first PSU and the second PSU at a combined load level for that hypothetically enabled PSU reflecting the combined load of the first PSU and the second PSU.
12. The system of claim 11 , wherein in computing the system power consumptions the PSU selector further:
derives the combined load level for the hypothetically enabled one of the first PSU and the second PSU based on the received data indicating a respective current load rating of each of the first PSU and the second PSU and the respective efficiency data of the first PSU and the second PSU; and
calculates the efficiency value of the hypothetically enabled PSU at the combined load level based on the respective efficiency data of the first and second PSUs.
13. The system of claim 7 , wherein the load is an information handling system and the PSU selector is included in one of (a) the information handling system and (b) the redundant power system.
14. The system of claim 7 , wherein the PSU selector is communicatively coupled to the redundant power system via a communication network.
15. An information handling system comprising:
a processor;
a power system having a plurality of power supply units (PSUs) operated to supply power to the information handling system and a power management controller (PMC) communicatively coupled to the processor; and
a memory having power management code which, when executed by the processor, causes the processor to configure the PMC to selectively disable at least one PSU from the plurality of PSUs in order to reduce system power consumption in connection with supplying power to the information handling system, wherein the processor operates in tandem with the PMC to:
receive operational data for each PSU, including a current load rating, efficiency data for a set of load ratings, and sleep power consumption data;
compute a system power consumption for each of a plurality of configurations, where at least one different PSU is hypothetically disabled from supplying power while each remaining PSU is hypothetically enabled to supply power required for the load, each computation taking into consideration the sleep power consumption data of the hypothetically disabled at least one PSU;
compare a resulting plurality of computed system power consumptions to identify which specific configuration of the plurality of configurations yields a lowest system power consumption; and
in response to a determination that system power consumption can be reduced by implementing the specific configuration while providing a required supply power to the load, implement the specific configuration of the PSUs within the RPS, wherein the at least one PSU is disabled, while the remaining PSUs are enabled.
16. The information handling system of claim 15 , wherein the processor performs the computing and comparing processes in response to detection of a hot spare condition within the RPS, wherein the specific configuration is implemented while a present operating condition of the RPS remains the hot spare condition.
17. The information handling system of claim 15 , wherein to implement the specific configuration, the PMC:
disables the at least one PSU from supplying power, wherein disabling the at least one PSU from supplying power places the at least one PSU into a sleep mode during which the PSU is held in readiness to supply power when required; and
enables the remaining at least one PSU to supply power required for the load.
18. The information handling system of claim 15 , wherein the RPS comprises a first PSU and a second PSU, and wherein to compute the system power consumption for each of a plurality of configurations, the processor:
computes a first system power consumption for a first configuration in which the first PSU is hypothetically disabled from supplying power and the second PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the first PSU; and
computes a second system power consumption for a second configuration in which the second PSU is hypothetically disabled from supplying power and the first PSU is hypothetically enabled to supply power required by the load, taking into consideration the sleep power consumption data of the second PSU.
19. The information handling system of claim 18 , wherein in computing the system power consumptions the processor performs the computation with consideration of an efficiency value of the hypothetically enabled one of the first PSU and the second PSU at a combined load level for that hypothetically enabled PSU reflecting the combined load of the first PSU and the second PSU.
20. The information handling system of claim 18 , wherein in computing the system power consumptions the processor further:
derives the combined load level for the hypothetically enabled one of the first PSU and the second PSU based on the received data indicating a respective current load rating of each of the first PSU and the second PSU and the respective efficiency data of the first PSU and the second PSU; and
calculates the efficiency value of the hypothetically enabled PSU at the combined load level based on the respective efficiency data of the first and second PSUs.