T
ECHNOLOGY
B
RIEF
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Engineers began by designing the system board so that it could plug into a side plane to permit full
front-to-back air movement. Baffles within the server help to direct airflow from the front of the
server, past the components with critical cooling requirements, and out the back.
Two large, 6-inch fans in the rear pull air through the server and keep the system cool. Two
additional 6-inch fans in the front of the server provide redundancy and blow air into the system if
one of the rear fans fails.
Compaq engineers designed an entirely new fan to allow optimal placement within the ProLiant
590/64 server. To maintain parts consistency throughout the server, engineers designed the fan so
that it could be used in both the front and back locations in the server (see Figure 8). This required
that the connector be placed on the side of the fan. A fan ejector mechanism on the server moves
the plug to and from the fan connector, giving the fan room to slide in at an angle and then lock
into place. The mechanism is designed to make removal of the fans quick and easy. All four fans
are hot pluggable and can be replaced one at a time while the system is running and mounted in the
rack. LEDs on these fans are visible from both sides.
Figure 8: The ProLiant DL590/64 uses the same fan design in both the front and back of the
server.
A second fan (Figure 9) was designed to cool the system power modules, media bay, and PCI area
of the server. Engineers modified an existing Compaq fan design so that it could be hot plugged
from the top and placed in an optimal position to cool these components. The ProLiant DL590/64
server uses four of these hot-pluggable, redundant 6-inch fans.
Figure 9: Four hot-pluggable, redundant 6-inch fans cool the system power modules, media bay,
and PCI area of the server.
Built-in fans on the primary power supplies further enhance cooling in the server. The direct
correspondence between these primary power supplies and system power modules also enhances
cooling by directing airflow from the built-in fans through the server.
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TC020702TB
