Compaq DL590 - HP ProLiant - 1 GB RAM Technology Brief page 10

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ECHNOLOGY RIEF
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Engineers began by designing the system board so that it could plug into a side plane to permit full
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front-to-back air movement. Baffles within the server help to direct airflow from the front of the
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server, past the components with critical cooling requirements, and out the back.
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Two large, 6-inch fans in the rear pull air through the server and keep the system cool. Two
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additional 6-inch fans in the front of the server provide redundancy and blow air into the system if
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one of the rear fans fails.
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Compaq engineers designed an entirely new fan to allow optimal placement within the ProLiant
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590/64 server. To maintain parts consistency throughout the server, engineers designed the fan so
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that it could be used in both the front and back locations in the server (see Figure 8). This required
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that the connector be placed on the side of the fan. A fan ejector mechanism on the server moves
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the plug to and from the fan connector, giving the fan room to slide in at an angle and then lock
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into place. The mechanism is designed to make removal of the fans quick and easy. All four fans
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are hot pluggable and can be replaced one at a time while the system is running and mounted in the
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rack. LEDs on these fans are visible from both sides.
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Figure 8: The ProLiant DL590/64 uses the same fan design in both the front and back of the
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A second fan (Figure 9) was designed to cool the system power modules, media bay, and PCI area
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of the server. Engineers modified an existing Compaq fan design so that it could be hot plugged
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from the top and placed in an optimal position to cool these components. The ProLiant DL590/64
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. . server uses four of these hot-pluggable, redundant 6-inch fans.
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Figure 9: Four hot-pluggable, redundant 6-inch fans cool the system power modules, media bay,
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Built-in fans on the primary power supplies further enhance cooling in the server. The direct
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correspondence between these primary power supplies and system power modules also enhances
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cooling by directing airflow from the built-in fans through the server.
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server.
and PCI area of the server.