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October 2006 Power supply installation
1002rp Server Hardware Installation 55
About the power distribution unit
Introduction
A PDU is installed in a rack that has DC-powered servers. Power from the
DC supply source enters the PDU and can then be distributed to one or more
servers. A single PDU can supply DC power to four DC power supply
modules. A server can have either one or two power supply modules
installed. You can determine the number of PDUs to install in a rack by
counting the number of power supply modules in each rack.
PDU power and grounding
To ensure a complete power and grounding installation:
In rackmount DC-powered server installations, ensure the PDU (Power
Distribution Unit for DC applications) is installed on the same rack as the
CallPilot server. This is required since the main ground wire for the PDU
is not insulated from the metal enclosure.
Multiple PDUs
A server operates on a single power supply module. Its total capacity is two
installed power supply modules. The second power supply module is the
redundant power supply module.
A PDU can distribute power to a maximum of four power supply units that
can be installed in two or more servers. Therefore, if there are three or four
servers installed in a rack, then you must install a second PDU.
Note: The power supply module installs in the server. It does not refer to a
UPS, which is a separate unit on the rack.