Troubleshooting

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The module fault LED on the ops panel displays a solid amber color to indicate a fault. All alarms are also reported by using SES.

Table 1. Alarm Conditions
Status Severity
PSU alert – loss of DC power from a single PSU Fault - loss of redundancy
Cooling module fan failure Fault - loss of redundancy
PSU removed Configuration error
Enclosure configuration error (VPD) Fault - critical
Low temperature warning Warning
High temperature warning Warning
Over-temperature alarm Fault - critical
Under-temperature alarm Fault - critical
I2C bus failure Fault - loss of redundancy
Ops panel communication error (I2C) Fault - critical
RAID error Fault - critical
Drive power control fault Warning; no loss of drive power
Drive power control fault Fault - critical; loss of drive power
Insufficient power available Warning

For more information on how to remove and replace a module, see Module replacement.

Thermal monitoring and control

The system uses extensive thermal monitoring and takes a number of actions to ensure that component temperatures are kept low and also to minimize acoustic noise. Air flows from the front to the rear of the enclosure.

Symptom
If the ambient air is below 77 °F (25 °C) and the fans are observed to increase in speed, then some restriction on airflow might be causing internal temperature rise.
Note: It is not a fault condition.
Cause
The first stage in the thermal control process is for the fans to automatically increase in speed when a thermal threshold is reached. It can be caused by higher ambient temperatures in the local environment and can be perfectly normal.
Note: This threshold changes according to the number of drives and power supplies fitted.
Action
  1. Check the installation for any airflow restrictions at either the front or rear of the enclosure. A minimum gap of 25 mm at the front and 50 mm at the rear is needed.
  2. Check for restrictions due to dust buildup. Clean.
  3. Check for excessive recirculation of heated air from rear to the front. Use of the enclosure in a fully enclosed rack is not ideal.
  4. Check that all blank modules are in place.
  5. Reduce the ambient temperature.

Thermal alarm

Symptom
Ops panel module fault LED is amber.
Cause
The internal temperature exceeded a preset threshold.
Action
  1. Check that the local ambient environment temperature is below the specification (see the technical specifications).
  2. Check the installation for any airflow restrictions at either the front or rear of the enclosure. A minimum gap of 1 in. (25 mm) at the front and 2 in. (50 mm) at the rear is recommended.
  3. Check for restrictions due to dust buildup. Clean.
  4. Check for excessive recirculation of heated air from rear to the front. Use of the enclosure in a fully enclosed rack is not recommended.
  5. If possible, shut down the enclosure and investigate the problem.