Troubleshooting; Check System Temperature; Fans And Sensors; What You Should Do - HPE Nimble Storage HF Series Hardware Manual

Troubleshooting

This section describes how to check the temperature of your storage array and expansion shelves to prevent overheating,
and keep your system operating at safe levels.

Check System Temperature

Like any electronic device, HPE storage arrays and expansion shelves generate heat. The amount of heat generated, BTU per
hour, depends on the model.

Fans and Sensors

HPE 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.
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. External (ambient air) temperature is monitored by redundant sensors
on the front of the chassis. The arrays and expansion shelves generate alerts and alarms based on internal temperatures of
the chassis and external temperature.
Table 30: External Temperatures
External Temperature
Below 35°C (95°F)
At approximately 33°C (91.4°F)
At approximately 35°C (95°F)
At approximately 45°C (113°F)
At approximately 50°C (122°F)

What You Should Do

Temperature alert messages from the HPE storage array are the result of:
Inadequate air circulation
Excessive external temperature
A combination of both conditions
Check for these conditions surrounding the array and expansion shelves, and take the necessary corrective action to cool the
environment in front of and around the array.
If you believe that the ambient temperature might exceed the specified safe level for the array, consider stopping I/O and
then manually shutting down the array and its attached expansion shelves. That action avoids the possibility of a sudden,
unplanned array shutdown.
Environment
Proper temperature
Temperature too warm
Temperature too high
Temperature too hot
Exceeds safe operating temperature
Result
System operates normally
Controller sends an information alert that
the system is approaching the safe oper-
ating limit
Controller sends a warning alert
prompting user to take corrective action
to check airflow and cooling
Controller sends a critical alert indicating
imminent shutdown if temperature con-
tinues to rise
Controller shuts down the array
Troubleshooting 149