Compaq 112726-001 - ProLiant - 6500 Technology Brief page 12

ECG078/0698
T B
ECHNOLOGY RIEF
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The server also has one primary hot-plug fan and one redundant hot-plug fan for the I/O board in
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the upper section of the server (Figure 7). Should the primary fan fail, the redundant fan will
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start automatically.
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H o t - P l u g
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The server fan control logic operates independent of the system processor and operating system
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(OS). Regardless of the OS that is running or its condition, the fan control logic and the server
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temperature monitoring circuitry work together to cool the server effectively.
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The fans have two speeds: normal and high. Under typical circumstances, the normal fan speed
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is sufficient to cool up to four processors, eighteen hard disk drives, and ten I/O expansion boards.
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As a precaution against increases in ambient air or localized internal temperatures, Compaq has
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established three thermal trip points, as shown in Figure 8. When the first thermal trip point is
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Users can select whether to enable the following server response to the second thermal trip point.
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If the internal air temperature exceeds the second trip point, the OS initiates a controlled
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shutdown of the server. Simultaneously, a warning message is sent to the IMD and Compaq
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Insight Manager. The server restarts automatically when it has cooled sufficiently.
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Finally, in the unlikely event server temperature continues to rise, a third trip point shuts down
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the power supplies to protect critical components from overheating. The server restarts
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automatically when it has cooled sufficiently.
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(cont.)
P r i m a r y
H o t - P l u g
F a n
Figure 7: Hot-plug fans for the I/O section.
O K
Failed
Failed OK
(Green)
( A m b e r )
(Amber) (Green)
L E D s