Specifications

Figure 16. The HP SEU-2 block diagram
All hot-plug
8 PCI I/O s lots
I/O controller
I/O controller
8 PCI I/O s lots
P CI- X Backplane
Core I/O
Core I/O
Core I/O
P eripheral bay
Bulk
power
supplies
E - L ink cable assembly
Connection
to host server
Disks
AC power subsystem
The HP 9000 rp7440 and rp8440 Servers were designed to take full advantage of the multi-grid
power inputs found in today’s high-end data centers, which means that both servers can connect to
two independent power grids at the same time and 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 sections.
Fault-tolerant power compliance in the HP 9000 rp7440 Server
The AC input to the HP 9000 rp7440 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 to 240 V
operation). A minimum of two power cords is used to maintain normal operation of the HP 9000
rp7440 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 to enable redundancy and hot-swap functionality of the bulk power
supplies. This power is routed from four individual 20-A circuit breakers through 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 HP 9000 rp7440 Server.
Figure 17 shows the HP 9000 rp7440 Server power configuration. Each AC inlet feeds one HP 9000
rp7440 Server 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 HP 9000 rp7440 Server has
2N redundant power protection.
The dual AC modular bulk power supplies provide:
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