Redundant Hot-Plug Fans - Compaq ProLiant 8000 Technology Brief

TC000603TB
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ECHNOLOGY RIEF
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Redundant Hot-Plug Fans

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The ProLiant 8000 server has four primary hot-plug fans (external) and four redundant fans
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(internal) for the processor and memory section. The rear pair of primary hot-plug fans for the
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processor and memory section is enclosed in a single fan unit (Figure 5). This unit can be easily
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removed by means of a single thumbscrew. The front pair of primary hot-plug fans is enclosed in
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another single fan unit (Figure 6), which can be easily removed by means of a latch. The primary
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hot-plug fans spin under rotor control while the internal, redundant fans spin freely in the server
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airflow because they are not required for cooling. If the primary fan unit fails, the redundant fans
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will start automatically. The hot-plug light-emitting diodes (LEDs) indicate the status of the fans:
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green indicates the fans are functioning properly, and amber indicates the fans have failed.
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Thumbscrew
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for removal
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Hot-Plug LEDs
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Figure 5: Rear hot-plug fans for the processor and memory section of the ProLiant 8000 server.
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Hot-Plug LEDs
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Latch for removal
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Figure 6: Front hot-plug fans for the processor and memory section of the ProLiant 8000 server.
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(cont.)
Redundant fan unit
Primary fan unit
Redundant fan unit
Primary fan unit