Multi-level redundant cooling system for continuous cooling of an electronic system(s)

A cooled electronic assembly comprising:

• an electronics rack, the electronics rack comprising one or more electronic systems;
• and
• a cooling system for cooling the one or more electronic systems, the cooling system comprising:
• a coolant-based cooling apparatus configured to assist in removal of heat generated by one or more electronic systems, the coolant-based cooling apparatus being disposed within the electronics rack and comprising at least one heat exchange assembly to discharge heat from coolant of the coolant-based cooling apparatus to an ambient airflow passing across the at least one heat exchange assembly, the ambient airflow discharging from the electronics rack in a first region of an air exhaust side of the electronics rack;
• redundant pumping units to facilitate pumping of the coolant through the coolant-based cooling apparatus and thereby assist in removal of heat generated by the one or more electronic systems, and discharge of the heat via the at least one heat exchange assembly, wherein the redundant pumping units are coupled to the coolant-based cooling apparatus in parallel fluid communication to separately provide pumping of the coolant through the coolant-based cooling apparatus;
• at least one primary air-moving device to provide a primary airflow across the one or more electronic systems to cool the one or more electronic systems, the coolant-based cooling apparatus assisting in cooling the one or more electronic systems in combination with the primary airflow provided by the primary air-moving device, the primary airflow being distinct from the ambient airflow across the at least one heat exchange assembly of the coolant-based cooling apparatus, and the primary airflow discharging from the electronics rack in a second region of the air exhaust side of the electronics rack, the second region being different from the first region;
• redundant auxiliary blowers to provide, when active, an auxiliary airflow across the one or more electronic systems to provide, at least in part, auxiliary airflow cooling thereof, the redundant auxiliary blowers being distinct from the at least one primary air-moving device, and the auxiliary airflow provided by the redundant auxiliary blowers passing differently across the one or more electronic systems than the primary airflow provided by the at least one primary air-moving device, and the auxiliary airflow discharging from the electronics rack in a third region of the air exhaust side of the electronics rack, the third region being different from the first region and the second region;
• and
• multiple separate controllers, the multiple separate controllers controlling operation of the redundant pumping units and the redundant auxiliary blowers based, at least in part, on one or more sensed parameters, wherein at least one controller of the multiple separate controllers activates the redundant auxiliary blowers responsive to the one or more sensed parameters exceeding a set threshold, the redundant auxiliary blowers being controllable to provide, at least in part, the auxiliary airflow cooling to the one or ore electronic systems in combination with cooling by the coolant-based cooling apparatus and the primary airflow.