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

Power distribution for standard (legacy) server blade enclosures
Within the standard server blade enclosure, a shared power backplane distributes the DC power from
each independent bus bar (or bus box) across all ten server blade and interconnect bays (Figure 2).
Figure 2. In the standard server blade enclosure(s), the shared power backplane distributes power from each side
(A and B) of the power supply enclosure across all ten bays of the server blade enclosure.
“A” side DC
“B” side DC
A B
The standard server blade enclosure supports first, second, and selected third generation ProLiant
BL20p blades, as well as the ProLiant BL40p series server blades. Refer to the HP BladeSystem
enclosure
compatibility matrix for information on which server blade models are supported in the
standard server blade enclosure.
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AC redundancy considerations in server blade enclosures
The power management firmware (version 2.03 or higher) calculates redundancy based on the type
of server blade enclosure. For enhanced server blade enclosures, the power supplies on each side of
the power enclosure are required to power the server blades on that same side, both the interconnect
bays, and the enclosure management module. For standard server blade enclosures, each side of the
power enclosure must be able to power up all the server blades and interconnects in that enclosure.
It is important to note that the interconnect bays and the enclosure management module continue to
share power from both sides (A and B) of the power subsystem. This allows both interconnect modules
as well as internal chassis communication to continue in the event of a power failure from a single AC
input.
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The compatibility matrix is available at
http://h18004.www1.hp.com/products/blades/components/Compatibility-Matrix.html
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