
Troubleshooting and Problem Solving
4.5.4Thermal Alarm
| Symptom | Cause |
| Action |
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1 | Ops Panel FAULT | If the internal | 1 | Check local ambient environment |
| LED AMBER. | temperature measured in |
| temperature is below the upper 40°C |
2 | An AMBER LED on | the airflow through the |
| specification. |
enclosure exceeds a pre- | 2 | Check the installation for any airflow | ||
| one or more Power | set threshold a thermal | ||
| Supply/Cooling | alarm will sound. |
| restrictions at either the front or rear |
| Modules. |
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| of the enclosure. A minimum gap of |
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| 25mm at the front and 50mm at the |
3 | Audible Alarm |
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| rear is recommended. |
| Sounding. |
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4 | Air temperature |
| 3 | Check for restrictions due to dust |
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| exiting PSU above |
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| 55°C. |
| 4 | Check for excessive |
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| heated air from rear to the front, use |
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| in a fully enclosed rack installation is |
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| not recommended. |
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| 5 | If possible shutdown the enclosure |
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| and investigate the problem before |
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| continuing. |
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4.5.5Thermal Shutdown
Important For thermal warnings please refer to the SES specification.
An Enclosure will shut down when a critical temperature threshold is exceeded in order to prevent permanent damage to the disk drives.
4.6Drive Carrier Module Faults
Disk drive status is monitored by a Green LED and an Amber LED mounted on the front of each Drive Carrier Module, providing the following indications:
Table
State | Green | Amber |
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No drive fitted | Off | Off |
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Drive Power ON | On | Off |
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Drive Activity | On/Blink off | Off |
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Drive Fault | On | On |
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Drive activity - LED may be off for a length of time during power up.
44 | IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide |