Compaq ProLiant 8000 Compaq ProLiant 8000 Server Technology - Page 13

Redundant Hot-Plug Fans

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TC000603TB TECHNOLOGY BRIEF (cont.) ... Redundant Hot-Plug Fans The ProLiant 8000 server has four primary hot-plug fans (external) and four redundant fans (internal) for the processor and memory section. The rear pair of primary hot-plug fans for the processor and memory section is enclosed in a single fan unit (Figure 5). This unit can be easily removed by means of a single thumbscrew. The front pair of primary hot-plug fans is enclosed in another single fan unit (Figure 6), which can be easily removed by means of a latch. The primary hot-plug fans spin under rotor control while the internal, redundant fans spin freely in the server airflow because they are not required for cooling. If the primary fan unit fails, the redundant fans will start automatically. The hot-plug light-emitting diodes (LEDs) indicate the status of the fans: green indicates the fans are functioning properly, and amber indicates the fans have failed. Thumbscrew for removal Hot-Plug LEDs Redundant fan unit Primary fan unit Figure 5: Rear hot-plug fans for the processor and memory section of the ProLiant 8000 server. Hot-Plug LEDs Latch for removal Redundant fan unit Primary fan unit Figure 6: Front hot-plug fans for the processor and memory section of the ProLiant 8000 server. 13

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T
ECHNOLOGY
B
RIEF
(cont.)
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TC000603TB
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Redundant Hot-Plug Fans
The
ProLiant
8000 server has four primary hot-plug fans (external) and four redundant fans
(internal) for the processor and memory section.
The rear pair of primary hot-plug fans for the
processor and memory section is enclosed in a single fan unit (Figure 5).
This unit can be easily
removed by means of a single thumbscrew.
The front pair of primary hot-plug fans is enclosed in
another single fan unit (Figure 6), which can be easily removed by means of a latch.
The primary
hot-plug fans spin under rotor control while the internal, redundant fans spin freely in the server
airflow because they are not required for cooling.
If the primary fan unit fails, the redundant fans
will start automatically.
The hot-plug light-emitting diodes (LEDs) indicate the status of the fans:
green indicates the fans are functioning properly, and amber indicates the fans have failed.
Primary fan unit
Redundant fan unit
Thumbscrew
for removal
Hot-Plug LEDs
Figure 5:
Rear hot-plug fans for the processor and memory section of the
ProLiant
8000 server.
Hot-Plug LEDs
Latch for removal
Primary fan unit
Redundant fan unit
Figure 6:
Front hot-plug fans for the processor and memory section of the
ProLiant
8000 server.