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