Compaq DL590 - HP ProLiant - 1 GB RAM Technology Brief page 9

TC020702TB
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ECHNOLOGY RIEF
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Figure 7: The ProLiant DL590/64 server uses a distributed power system.
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For each system power module plugged into the system, a corresponding primary power supply
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must also be plugged in. This one-to-one relationship is required because each system power
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module depends on the fans in the corresponding primary power supply for cooling, and the
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redundancy helps maintain availability.
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The primary power supplies and their associated system power modules are N+1 redundant and
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load balancing. When using high-line power, two of the primary power supplies can provide up to
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2500 watts of power—more than the 2 kilowatts required by a fully loaded ProLiant DL590/64
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server. The third power supply provides redundancy in a fully configured system.
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A lightly loaded ProLiant 590/64 server may operate satisfactorily using low-line power; however,
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if low-line power is used, redundancy of the power supplies may be sacrificed and the server
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power demand may exceed the total amount of power available. Compaq strongly recommends
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using high-line power to operate ProLiant DL590/64 servers when possible.
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All of the power supplies and system power modules in the ProLiant DL590/64 server are hot
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pluggable, so a failed power supply in a redundant configuration can be replaced while the server
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. . is up and running. Easy-to-use light-emitting diodes (LEDs) and levers simplify the identification
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and replacement of a failed power supply.
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The ProLiant DL590/64 server has a built-in AC transfer switch that provides AC line redundancy.
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This feature allows the server to operate from either of two independent AC power sources. If a
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second AC power source is present and connected, the server will automatically switch to the
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second AC source if the primary source fails. The server will automatically switch back to the
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primary source as soon as it returns to its specified limits of operation. The AC line redundancy
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feature only functions with use of high-line power.
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Cooling
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The high-performance Itanium processors, massive amounts of memory, and other components in
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the ProLiant 590/64 server require unprecedented levels of power. As a result of this large power
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draw, heat generation is a critical issue that required careful consideration of server cooling and
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airflow.
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