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A rack-mountable computer system enables an airflow that cools components in an upstream portion of the computer system interior to be cooled through mixing with a bypass airflow downstream of the components in the upstream portion. The mixed airflow can cool components in a downstream portion of th

A rack-mountable computer system enables an airflow that cools components in an upstream portion of the computer system interior to be cooled through mixing with a bypass airflow downstream of the components in the upstream portion. The mixed airflow can cool components in a downstream portion of the interior. The bypass airflow is directed by a bypass plenum that is unencompassed by the separate plenum that directs the airflow to cool the upstream portion components. The bypass plenum can be established by one surface of a component that supports one or more heat-producing components in the separate plenum, including an underside of a circuit board mounted in the interior. Relative flow rates through the separate plenums can be adjusted, via flow control elements, to separately control heat removal from components upstream and downstream of the air mixing, based at least in part upon air temperatures in the separate interior portions.

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1. A system for storing data, comprising: a rack; andone or more computer systems mounted on the rack, at least one of the computer systems comprising: a chassis, having an inlet end and an exhaust end, that at least partially encompasses a chassis interior;a circuit board installed in an upstream p

1. A system for storing data, comprising: a rack; andone or more computer systems mounted on the rack, at least one of the computer systems comprising: a chassis, having an inlet end and an exhaust end, that at least partially encompasses a chassis interior;a circuit board installed in an upstream portion of the chassis interior that is proximate to the inlet end of the chassis, the circuit board comprising an upper surface upon which an upstream heat-producing component is installed;at least one inlet air plenum that extends through a portion of the chassis interior above the upper surface of the circuit board and is configured to direct an inlet air flow received from the inlet end of the chassis through at least the upstream portion of the chassis interior in heat transfer communication with the upstream heat-producing component, such that the inlet air flow removes heat from the upstream heat-producing component;at least one bypass air plenum that extends through a portion of the chassis interior beneath a lower surface of the circuit board, the at least one bypass air plenum being unencompassed by the inlet air plenum and configured to direct a bypass air flow that is isolated from the inlet air flow to mix with the inlet air flow downstream of the upstream heat-producing component to establish a mixed air flow; anda downstream heat-producing component installed in a downstream portion of the chassis interior that is proximate to the exhaust end of the chassis, wherein the downstream portion of the chassis interior is configured to direct the mixed air flow through the chassis interior to remove heat from the downstream heat-producing component. 2. The system of claim 1, wherein: the circuit board is configured to be adjustably installed in one of a plurality of elevations in the upstream portion of the chassis interior to provide adjustable control of a cross-sectional area of each of the bypass air plenum and the inlet air plenum, based at least in part upon separate maximum operating temperatures separately corresponding to the upstream heat-producing component and downstream heat-producing component. 3. The system of claim 1, comprising: a flow control element configured to adjust a cross-sectional area of a separate one of the bypass air plenum and the inlet air plenum to provide controllable complementary adjustment of the relative flow rates of both the bypass air flow and the inlet air flow; andone or more sets of air moving devices collectively configured to provide at least controllable adjustment of collective flow rates of the inlet air flow and the bypass air flow;wherein the flow control element and the one or more sets of air moving devices are configured to be collectively controllably adjusted, based at least in part upon both a present operating temperature of the upstream heat-producing component and another present operating temperature of the downstream heat-producing component. 4. The system of claim 1, wherein: the circuit board comprises a discharge vent that communicatively couples the bypass air plenum with the inlet air plenum at a location in the inlet air plenum that is downstream of the upstream heat-producing component; andto direct a bypass air flow that is isolated from the inlet air flow to mix with the inlet air flow downstream of the upstream heat-producing component, the bypass air plenum is configured to direct at least a portion of the bypass air flow from the bypass air plenum to the inlet air plenum, downstream of the upstream heat-producing component, via the discharge vent. 5. A computer system, comprising: a chassis, having an inlet end, that at least partially encompasses a chassis interior;at least one inlet air plenum configured to direct an inlet air flow received from the inlet end of the chassis through at least an upstream portion of the chassis interior that is proximate to the inlet end to remove heat from an upstream heat-producing component installed in the upstream portion of the chassis interior; andat least one bypass air plenum that extends through a portion of the chassis interior that is unencompassed by the inlet air plenum and is configured to direct a bypass air flow that is isolated from the inlet air flow to mix with the inlet air flow downstream of the upstream heat-producing component and remove heat from a downstream heat-producing component, wherein the at least one bypass air plenum is configured to isolate the portion of the chassis interior that is unencompassed by the inlet air plenum from the upstream heat-producing component. 6. The computer system of claim 5, comprising: at least one inlet air vent, included in the inlet end of the chassis, that is configured to direct at least some air from an external environment into the inlet air plenum as the inlet air flow; andat least one bypass air vent that is separate from the at least one inlet air vent and is configured to direct at least some other air from the external environment into the bypass air plenum as the bypass air flow;wherein the at least one bypass air vent is included in an end of the chassis that is separate from the inlet end of the chassis. 7. The computer system of claim 5, comprising: a circuit board supporting the upstream heat-producing component in the upstream portion of the chassis interior, wherein the circuit board is configured to partition at least a portion of the chassis interior to establish the inlet air plenum and the bypass air plenum, wherein a circuit board surface supporting the upstream heat-producing component establishes a boundary of the inlet air plenum and an opposite circuit board surface establishes a boundary of the bypass air plenum. 8. The computer system of claim 7, wherein: the circuit board comprises a discharge vent that communicatively couples the bypass air plenum with a portion of the chassis interior that is in heat transfer communication with the inlet air flow downstream of the upstream heat-producing component; andto direct a bypass air flow that is isolated from the inlet air flow to mix with the inlet air flow downstream of the upstream heat-producing component, the bypass air plenum is configured to direct at least a portion of the bypass air flow from the bypass air plenum to the portion of the chassis interior via the discharge vent. 9. The computer system of claim 7, wherein: the circuit board is configured to be installed in the chassis interior at one of a plurality of elevations relative to a bottom end of the chassis to adjust relative cross-sectional areas of both the inlet air plenum and the bypass air plenum. 10. The computer system of claim 5, wherein: to direct a bypass air flow that is isolated from the inlet air flow to mix with the inlet air flow downstream of the upstream heat-producing component, the at least one bypass air plenum is configured to direct the bypass air flow to mix with the inlet air flow to establish a mixed air flow that is directed through the chassis interior to remove heat from at least the downstream heat-producing component in a downstream portion of the chassis interior. 11. The computer system of claim 10, comprising: a flow control element configured to adjust a cross-sectional area of a separate one of the bypass air plenum and the inlet air plenum to provide complementary adjustment of relative flow rates of both the bypass air flow and the inlet air flow; andwherein the flow control element is configured to adjust the cross-sectional area based at least in part upon both an operating temperature of the upstream heat-producing component and another operating temperature of the downstream heat-producing component. 12. The computer system of claim 11, wherein: to provide complementary adjustment of relative flow rates of both the bypass air flow and the inlet air flow, the flow control element is configured to dynamically adjust a cross-sectional area of a separate one of the bypass air plenum and the inlet air plenum to maintain each of the operating temperature of the upstream heat-producing component and the other operating temperature of the downstream heat-producing component within separate temperature margins of separate maximum operating temperatures corresponding to the separate upstream heat-producing component and the downstream heat-producing component. 13. The computer system of claim 5, comprising: a plurality of air moving devices installed to the chassis in the chassis interior, the plurality of air moving devices comprising: a particular set of air moving devices that are partitioned from the bypass air plenum and are configured to exclusively supply the inlet air flow received from the inlet air plenum to a downstream portion of the chassis interior; andanother set of air moving devices that are partitioned from the inlet air plenum and are configured to exclusively supply the bypass air flow received from the bypass air plenum to the downstream portion, such that the bypass air flow mixes with the inlet airflow in the downstream portion of the chassis interior. 14. A method, comprising: configuring a portion of an interior of a computer system to direct a bypass air flow of air to bypass flowing in heat transfer communication with at least one heat-producing component installed in the computer system interior and to establish a mixed air flow with a separate inlet air flow in a portion of the computer system interior that is downstream of the at least one heat-producing component in the computer system interior, wherein the configuring comprises: partitioning an upstream portion of the computer system interior that is proximate to the inlet end into separate air passages, wherein: a particular one of the separate air passages is configured to direct the inlet air flow to remove heat from the at least one heat-producing component, andanother one of the separate air passages is unencompassed by the particular air passage and is configured to direct the bypass air flow to mix with the inlet air flow in the portion of the computer system interior that is downstream of the at least one heat-producing component in the computer system interior and remove heat from a downstream heat-producing component, wherein the mixed air flow has a lower temperature than a temperature of the inlet air flow after the inlet air flow removes heat from the at least one heat-producing component. 15. The method of claim 14, wherein configuring a portion of the computer system interior to direct a bypass air flow of air to bypass flowing in heat transfer communication with at least one heat-producing component installed in the computer system interior and to mix with a separate inlet air flow in the portion of the computer system interior that is downstream of the at least one heat-producing component in the computer system interior comprises: installing, at an inlet end of the computer system interior, at least one particular inlet air vent that is configured to direct at least some air from an external environment into the particular air passage as the inlet air flow; andinstalling, at another end of the computer system interior that is separate from the inlet end, at least one other inlet air vent that is separate from the particular inlet air vent and is configured to direct at least some other air from the external environment into the other air passage as the bypass air flow. 16. The method of claim 14, wherein partitioning an upstream portion of the computer system interior that is proximate to the inlet end into a particular air passage and an isolated other air passage comprises: installing a circuit board in the upstream portion, where a surface of the installed circuit board that includes the upstream heat-producing component establishes a boundary of the particular air passage, and an opposite surface of the installed circuit board establishes a boundary of the other air passage. 17. The method of claim 16, wherein: the circuit board comprises a discharge vent that communicatively couples the other air passage with a portion of the computer system interior that is in flow communication with the inlet air flow and is downstream of the upstream heat-producing component in the computer system interior, wherein the other air passage directs the bypass air flow from the other air passage, via the discharge vent, to mix with the inlet air flow in the portion of the computer system interior. 18. The method of claim 14, comprising: configuring a portion of the computer system to provide complementary adjustment of relative flow rates of both the bypass air flow and the inlet air flow based at least in part upon adjustable control of a cross-sectional area of a separate one of the other air passage and the particular air passage. 19. The method of claim 18, wherein: configuring a portion of the chassis to provide complementary adjustment of relative flow rates of both the bypass air flow and the inlet air flow comprises installing, in the separate one of the other air passage and the particular air passage, a flow control element configured to adjust the cross-sectional area of the separate one of the other air passage and the particular air passage based at least in part upon separate operating temperatures associated with the upstream heat-producing component and a separate downstream heat-producing component that is installed in the computer system interior downstream of the portion of the computer system interior where the bypass air flow mixes with the inlet air flow. 20. The method of claim 19, wherein: to provide complementary adjustment of relative flow rates of both the bypass air flow and the inlet air flow, the flow control element is configured to dynamically adjust a cross-sectional area of a separate one of the other air passage and the particular air passage to maintain each of the operating temperature of the upstream heat-producing component and the other operating temperature of the downstream heat-producing component within separate temperature margins of separate predetermined maximum operating temperatures corresponding to the separate upstream heat-producing component and the downstream heat-producing component.