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Figure 18. The HP SEU block diagram
AC power subsystem
The HP Integrity rx7620-16 and rx8620-32 Servers were both designed to take full advantage of the
multi-grid power inputs found in today’s high-end data centers. This means that both servers can
connect to two independent power grids at the same time and are able to tolerate a grid failure
without causing computing interruptions. The power subsystems are so robust that they both are
certified (without deviations) under the Uptime Institute’s Fault Tolerant Power Compliance
Specification. The specific AC power subsystem details are covered separately in the following
section.
Fault-tolerant power compliance in the Integrity rx7620-16 Server
The AC input to the Integrity rx7620-16 Server is divided into four separate circuits. Each circuit is fed
by any 50 to 60 Hz high line source through four line cords. (“High line” refers to 200–240 volts.) A
minimum of two power cords is used to maintain normal operation of the Integrity rx7620-16 Server.
A second set of two cords is added to improve system availability by protecting, for example, against
power grid failures, failed power supplies, or accidentally tripped circuit breakers. Four power cords
are used in order to enable redundancy and hot-swap functionality of the bulk power supplies. This
power is routed from four individual 20-ampere circuit breakers via input line filters to two internal
bulk power supplies (BPSs). These four lines are labeled A0, B0, A1, and B1 at the line filter inputs on
the back panel of the Integrity rx7620-16 Server.
Figure 19 shows the Integrity rx7620-16 Server power configuration. Note that each AC inlet feeds
one Integrity rx7620-16 Server bulk power supply (BPS) and those two separate AC inlets feed each
bulk supply. The design of the individual BPSs and the configuration of the interconnect meet all the
conditions for fault-tolerant power compliance.
The benefit of this design is that when utilizing all four power cords, the Integrity rx7620-16 Server
has 2N redundant power protection.
The dual AC modular bulk power supplies provide:
• Redundancy for both hardware failures and power input failures
• Hot-plug capability for any BPS in a redundant configuration
• Better data security, maintenance scheduling, and maintenance operations without system
interruption
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