HP BladeSystem p-Class rack-centralized (3U) power solutions

the most recent information about which server blade models require the enhanced server blade

enclosure.

HP makes the following recommendations for configuring the HP BladeSystem p-Class power

subsystem:

• Use three-phase power for rack centralized power solutions

• Use 1U power enclosure where single phase power is required

• Design for redundancy

• Use the HP BladeSystem p-Class Sizing Utility

• Obtain real-time power information from iLO

• Configure power zones properly

Use three-phase power

Three-phase power is typically more efficient than single-phase power because it provides more than

150 percent of maximum available power provided by single-phase power. Three-phase power is

also more stable than single-phase power since it has three voltage waves and is at peak voltage

more of the time. HP BladeSystem p-Class systems require 30 or 32 amp, 200 to 240 VAC or a

direct facility power source of –48 VDC power (±10 percent). To gain the maximum benefit from the

dense server blade designs, HP recommends using the three-phase power enclosure because of its

greater efficiency, scalability and higher power capabilities, particularly to support the latest

microprocessors or double-density server blades such as the ProLiant BL30p series.

NOTE: NA/JPN and International three-phase power enclosures

use different types of three-phase power.

Design for redundancy

To ensure continuous, redundant power, HP recommends using two power enclosures whenever a

system includes enhanced server blade enclosures. Because the enhanced server blade enclosure

splits the DC power into the left and right sides of each server blade enclosure, customers must use

two power enclosures to configure AC line cord redundancy.

The compatibility matrix is available at

http://h18004.www1.hp.com/products/blades/components/Compatibility-Matrix.html