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A system for performing computing operations in a data center includes one or more sets of computer systems, one or more primary power systems, and a reserve power system. The primary power systems include at least one power distribution unit that supplies power to at least one of the sets of comput

A system for performing computing operations in a data center includes one or more sets of computer systems, one or more primary power systems, and a reserve power system. The primary power systems include at least one power distribution unit that supplies power to at least one of the sets of computer systems. The reserve power system automatically supplies power to at least one of the sets of computer systems if a condition is met (such as a failure of the primary power system).

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1. A system for supplying power, comprising: a plurality of racks each comprising a set of computer systems;two or more primary power systems coupled to, and configured to supply primary power to, the plurality of sets of computer systems, wherein at least one of the two or more primary power system

1. A system for supplying power, comprising: a plurality of racks each comprising a set of computer systems;two or more primary power systems coupled to, and configured to supply primary power to, the plurality of sets of computer systems, wherein at least one of the two or more primary power systems comprises: a downstream portion comprising a primary power-side power distribution unit (PDU) configured to distribute power to at least two of the sets of computer systems mounted in at least two respective racks,an upstream portion configured to selectively supply primary power from one or more primary power sources to the downstream portion; anda reserve power system comprising: one or more automatic transfer switches coupled to, and configured to automatically supply reserve power to, the at least two sets of computer systems mounted in the at least two respective racks through the primary power-side PDU of the downstream portion of the at least one primary power system; andtwo or more additional automatic transfer switches each coupled to, and configured to automatically supply reserve power to, a separate one of the at least two sets of computer systems mounted in respective ones of the at least two respective racks, wherein the reserve power is supplied downstream of the primary power-side PDU such that the upstream portion of the at least one primary power system and the primary power-side PDU of the downstream portion of the at least one primary power system are bypassed from feeding the separate one of the at least two sets of computer systems,wherein the total power requirements of the plurality of sets of computer systems exceed the capacity of the reserve power system to supply power;wherein the reserve power system is configured to selectively switch, via the one or more automatic transfer switches, the at least two sets of computer systems in the at least two respective racks from receiving primary power received from the upstream portion of the at least one primary power system via the primary power-side PDU to instead receiving reserve power from an upstream portion of the reserve power system via the primary power-side PDU; andwherein the reserve power system is further configured to selectively switch, via one of the two or more additional automatic transfer switches, one of the at least two sets of computer systems mounted in one of the at least two respective racks from receiving primary or reserve power via the primary power-side PDU to instead receiving reserve power from the reserve power system, wherein the reserve power supplied to the one of the at least two sets of computer systems bypasses the upstream portion of the at least one primary power system and the primary power-side PDU of the downstream portion of the at least one primary power system. 2. The system of claim 1, wherein: the upstream portion of the reserve power system comprises the one or more automatic transfer switches; andwherein at least one of the one or more automatic transfer switches is configured to automatically switch the downstream portion of the at least one primary power system from supplying primary power received from the upstream portion of the at least one primary power system to supplying reserve power received from the upstream portion of the reserve power system. 3. The system of claim 1, wherein: the plurality of sets of computer systems are included in one or more computing modules that comprise a first computing module and a second computing module;the two or more primary power systems comprise a first primary power system configured to supply power to the first computing module and a second primary power system configured to supply primary power to the second computing module; andthe reserve power system is configured to: automatically supply power to the first computing module via a downstream portion of the first primary power system to bypass an upstream portion of the first primary power system, andautomatically supply power to the second computing module via a downstream portion of the second primary power system to bypass an upstream portion of the second primary power system. 4. The system of claim 1, wherein: the upstream portion of the at least one primary power system comprises a primary power-side uninterruptible power supply (UPS); andwherein, to selectively switch the at least two sets of computer systems from receiving primary power received from the upstream portion of the at least one primary power system to instead receiving reserve power from an upstream portion of the reserve power system, the reserve power system is configured to selectively switch the primary power-side PDU from distributing primary power received from the primary power-side UPS to distributing reserve power received from the upstream portion of the reserve power system. 5. The system of claim 4, wherein: the upstream portion of the reserve power system comprises a reserve power-side UPS; andwherein, to selectively switch the at least two sets of computer systems from receiving primary power received from the upstream portion of the at least one primary power system to instead receiving reserve power from an upstream portion of the reserve power system, the reserve power system is further configured to selectively switch the primary power-side PDU from distributing primary power received from the primary power-side UPS to distributing reserve power received from the reserve power-side UPS. 6. The system of claim 1, wherein: the reserve power system comprises one or more shut-down devices; andto protect against overload of the reserve power system, at least one of the shut-down devices is configured to automatically shut down at least one of the sets of computer systems if at least one condition is met. 7. The system of claim 6, wherein the reserve power system is configured to prioritize at least one of the computer systems or at least one of the sets of computer systems, wherein the reserve power system is configured to shut-down at least one relatively low priority computer system while continuing to supply reserve power to at least one other computer system. 8. A system for providing reserve power to computer systems in a data center, comprising: a reserve power system coupled to, and configured to automatically supply power to two or more sets of computer systems mounted in two or more respective racks, wherein each of the two or more sets of computer systems are configured to receive power from one or more individual primary power systems if at least one condition is met, wherein each individual primary power system of the one or more primary power systems comprises an upstream portion and a downstream portion, wherein the downstream portion comprises a primary power-side power distribution unit (PDU) configured to distribute power to at least two of the sets of computer systems mounted in at least two respective racks, and wherein the reserve power system comprises: a reserve power source;an automatic transfer switch (ATS) configured to automatically switch at least two of the sets of computer systems mounted in at least two respective racks from receiving power from a primary power source through a primary power-side PDU of a downstream portion of an individual primary power system to instead receiving power from the reserve power source through the primary power-side PDU of the downstream portion of the individual primary power system, such that another set of computer systems mounted in another one of the racks continues to receive power from the primary power source through another primary power-side PDU of another downstream portion of another individual primary power system; andan additional automatic transfer switch (ATS) configured to automatically switch a separate one of the at least two sets of computer systems mounted in one of the at least two respective racks from receiving power from the primary power source through the individual primary power system to instead receiving power from the reserve power source through the reserve power system such that the upstream portion and the primary power-side PDU of the downstream portion of the individual primary power system are bypassed, and such that another set of the at least two sets of computer systems mounted in another one of the at least two respective racks continues to receive power from the primary power source through the other primary power-side PDU of the other downstream portion of the other individual primary power system,wherein the total power requirements of the two or more sets of computer systems coupled to the reserve power system exceed a capacity of the reserve power system to supply power. 9. The system of claim 8, wherein the additional automatic transfer switch comprises: a primary power input coupled to the individual primary power system;a reserve power input coupled to the reserve power system; anda single power output coupled to the separate one of the at least two sets of computer systems;wherein the additional automatic transfer switch is configured to selectively route power to the individual set of computer systems from the individual primary power system or the reserve power system. 10. The system of claim 9, wherein, to selectively route power to the input of the downstream portion of the individual primary power system from one of the upstream portions, the automatic transfer switch is configured to selectively route power to an input of the primary power-side PDU. 11. The system of claim 10, wherein: the upstream portion of the at least one primary power system comprises a primary power-side uninterruptible power supply (UPS); andthe upstream portion of the reserve power system comprises a reserve power-side UPS;wherein, to selectively route power to the power input of the primary power-side PDU, the automatic transfer switch is configured to selectively route power from one of the primary power-side UPS or the reserve power-side UPS. 12. The system of claim 8, wherein: the reserve power system comprises one or more shut-down devices; andto protect against overload of the reserve power system, at least one of the shut-down devices is configured to automatically shut down at least one of the sets of computer systems if at least one condition is met. 13. The system of claim 12, wherein the reserve power system is configured to prioritize at least one of the computer systems or at least one of the sets of computer systems, wherein the reserve power system is configured to shut-down at least one relatively low priority computer system while continuing to supply reserve power to at least one other computer system. 14. The system of claim 8, wherein the automatic transfer switch comprises a manual override. 15. A method of supplying reserve power to computer systems in a data center, comprising: monitoring a primary power feed supplied to at least two sets of computer systems mounted in at least two respective racks through an upstream portion and a downstream portion of an individual primary power system, wherein the downstream portion is configured to distribute received power to the at least two sets of computer systems via a primary power-side power distribution unit (PDU) of the downstream portion;in response to an at least partial failure of the primary power feed in the upstream portion of the individual primary power system, automatically switching, via an automatic transfer switch, the downstream portion of the primary power system from receiving the primary power feed from the upstream portion to instead receiving a reserve power feed from a reserve power system, such that the downstream portion of the individual primary power system distributes power received from the reserve power feed to the at least two sets of computer systems and the upstream portion is bypassed; andin response to an at least partial failure of the primary power feed in the downstream portion of the individual primary power system, automatically switching, via another automatic transfer switch, an individual set of the at least two sets of computer systems mounted in one of the at least two respective racks from receiving the primary power feed or the reserve power feed from the downstream portion of the individual primary power system to instead receiving the reserve power feed from the reserve power system, such that the downstream portion of the individual primary power system is bypassed;wherein total power requirements of the two or more sets of computer systems exceed the capacity of the reserve power system to supply power. 16. The method of claim 15, wherein: the upstream portion of the individual primary power system comprises a primary power-side uninterruptible power supply (UPS);the reserve power system comprises a reserve power-side UPS; andautomatically switching the downstream portion of the individual primary power system to receive the reserve power feed comprises switching from routing the primary power feed from the primary power-side UPS to the primary power-side PDU to routing the reserve power feed from the reserve power-side UPS to the primary power-side PDU. 17. The method of claim 15, wherein automatically switching the downstream portion of the individual primary power system comprises switching the downstream portion of one of a plurality of primary power systems to receive the reserve power feed, such that: the downstream portion of the one primary power system distributes power received from the reserve power feed to the at least two sets of computer systems, andat least one downstream portion of at least one other of the plurality of primary power systems continues to distribute power from the primary power feed to at least two other sets of computer systems. 18. The method of claim 15, further comprising automatically shutting down at least one of the computer systems if at least one condition is met to protect against overload of the reserve power system. 19. The method of claim 18, further comprising: prioritizing at least one of the computer systems or sets of computer systems; andautomatically shutting down at least one of the computer systems if at least one condition is met to protect against overload of the reserve power system.