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 a sensor 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 22: External Temperatures
Result
Environment
External Temperature
System operates normally
Proper temperature
Below 32°C (89.6°F)
Controller sends an information alert that
the system is approaching the safe oper-
ating limit
Temperature too warm
At approximately 32°C (89.6°F)
Controller sends a warning alert that the
system is approaching the safe operating
limit
Temperature too high
At approximately 35°C (95°F)
Controller sends a critical alert prompting
user to take corrective action to check
airflow and cooling
Temperature too hot
At approximately 38°C (100.4°F)
After two minutes, the controller shuts
down the array
Exceeds safe operating temperature
At approximately 40°C (104°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.
Troubleshooting 112
