Components .II
II. System Components
Front Cooling Fan Control Board
The front cooling fans’ main purpose is to cool the hard disk drives. These fans also have a fan control board like the rear cooling fans. The front cooling fan module consists of a control board, a hard disk drive LED status board, and two cooling fans. The message LED board mounted in the front of the cooling fan module consists of five sets of LEDs to represent the status of up to five hard disk drives. Each set has three LEDs which shows the power, activity, and status of each hard disk drive.
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| Gold Finger |
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| pin 1 |
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| LED Board Header |
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| Connector to the |
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| SCSI Back plane |
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| (For cable to connect to |
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| Board |
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| LED board) |
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Front cooling fan control board
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| LED Board Header | pin 1 | ||
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| (For cable to connect | to |
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| fan board) |
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| Hard drive Status LED (Red) |
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| Hard drive Access LED (Yellow) |
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| Hard drive Power LED (Green) |
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Hard disk drive message board |
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Message LED Description |
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Power LED |
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| Status LED | Description |
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off |
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| off | power subsystem OK and ready for hard drive insertion | |||||
on |
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| off | Hard disk drive is OK for operation | |||||
on |
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| on | Hard disk drive failure (*) |
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on |
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| fast flash | RAID in rebuilding (*) |
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on |
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| slow flash |
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fast flash |
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| on | Hard disk drive power failure/short circuit | |||||
fast flash |
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| fast flash | Fan failure |
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* Must be provided by RAID controller’s
18 | AP2500 Hardware Reference Guide |