User`s guide

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5: Troubleshooting
Solving Storage System Temperature Issues
This section explains storage system temperature conditions and problems in these
subsections:
•“Thermal Control” on page92
• “Thermal Alarm” on page 93
Thermal Control
The storage system uses extensive thermal monitoring and ensures that component
temperatures are kept low and acoustic noise is minimized. Airflow is from front to rear
of the storage system. Dummy modules for unoccupied bays in enclosures and blanking
panels for unoccupied bays in the rack must be in place for proper operation.
If the ambient air is cool (below 25
°C or 77 °F) and you can hear that the fans have sped
up by their noise level and tone, then some restriction on airflow might be raising the
storage system’s internal temperature. The first stage in the thermal control process is for
the fans to automatically increase in speed when a thermal threshold is reached. This
might be a normal reaction to higher ambient temperatures in the local environment. The
thermal threshold changes according to the number of drives and power supplies fitted.
If fans are speeding up, follow these steps:
1. Check that there is clear, uninterrupted airflow at the front and rear of the storage
system.
2. Check for restrictions due to dust buildup; clean as appropriate.
3. Check for excessive recirculation of heated air from the rear of the storage system to
the front.
4. Check that all blank plates and dummy disk drives are in place.
5. Reduce the ambient temperature.