Fans and Sensors

HPE Nimble Storage arrays and expansion shelves have multiple cooling fans. They remove excess heat from the controllers, expanders, backplane, and drives. There is also a fan in each power supply unit designed to remove excess heat from the power supply. Because of the redundant fans in the arrays, a single fan failure does not result in an overheat condition. If one or more fans fail, they can easily be replaced. See Replace a Fan.

The arrays and expansion shelves also have temperature sensors in each controller, each expander, and the backplane. These sensors monitor the temperatures inside the chassis. Internal temperatures are correlated to external temperatures to generate alerts. The temperature correlation is internal to the NimbleOS, and therefore adjusted automatically before it is displayed in the alerts. External temperature is monitored by redundant sensors on the front of the chassis. The array generates alerts and alarms based on internal temperatures of the chassis and external temperature.