Chapter 5. Rack planning 117
PDU control
PDUs can be switched and monitored, monitored only, or non-monitored. It
might be of interest to monitor the power usage at the outlet level of the PDU.
More power savings and data center control can be gained with PDUs on
which the outlets can be turned on and off.
5.1.1 Examples
Sometimes data center power is supplied from a single power feed, which can be
protected by a facility UPS. The power cabling that is shown in Figure 5-1 on
page 118 uses three PDUs. The PDUs can be supplied by using a 60 A,
200 - 240 V three-phase source or a 32 A, 380 - 415 V three-phase source. The
colors (red, blue, green) show the phases as separated by the PDUs.
Tip: In some countries, single-phase power can also be used in such
configurations. For more information, see IBM NeXtScale System Power
Requirements Guide, PRS4401, which is available at this website:
http://ibm.com/support/techdocs/atsmastr.nsf/WebIndex/PRS4401
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