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

A method comprising:

• providing a coolant-based cooling apparatus configured to assist in removal of heat generated by one or more electronic systems of an electronics rack, the coolant-based cooling apparatus being disposed within the electronics rack and comprising at least one heat exchange assembly to discharge beat 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;
• providing 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;
• providing at least one primary air-moving device to provide a primary airflow across 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 at least one 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;
• providing 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
• providing multiple separate controllers, the multiple separate controllers comprising at least one pumping unit controller for controlling operation of the redundant pumping units, and at least one auxiliary blower controller for controlling operation of the redundant auxiliary blowers, the at least one pumping unit controller and the at least one auxiliary blower controller operating independently and based, at least in part, on one or more sensed parameters, wherein the at least one auxiliary blower controller 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, auxiliary airflow cooling to the one or more electronic systems in combination with cooling by the coolant-based cooling apparatus and the primary airflow.