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
ResultEnvironmentExternal Temperature
System operates normallyProper temperatureBelow 35°C (95°F)
Controller sends an information alert that
the system is approaching the safe oper-
ating limit
Temperature too warmAt approximately 33°C (91.4°F)
Controller sends a warning alert
prompting user to take corrective action
to check airflow and cooling
Temperature too highAt approximately 35°C (95°F)
Controller sends a critical alert indicating
imminent shutdown if temperature con-
tinues to rise
Temperature too hotAt approximately 45°C (113°F)
Controller shuts down the arrayExceeds safe operating temperatureAt 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.
Troubleshooting 149
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