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pSeries Systems Handbook
Tall frames contain a SEPBU power subsystem to accommodate all SP
processor nodes. The SEPBU is equipped with redundant (N+1) power supply
modules; if one module fails, another takes over. The self-regulating SEPBUs
are designed for concurrent maintenance; a failed power module can be
removed and repaired without interrupting running processes on the nodes.
For improved system availability, you can use two separate ac power sources for
your SP system using the SP frame redundant power supply (F/C 3885, 3886).
These 1.93 m frames are completely compatible with all existing SP systems. All
existing nodes and SP switch types can be directly installed as long as
configuration rules are not violated.
However, High Performance switches are withdrawn from production and are not
compatible with most current SP system hardware.
When you order a frame feature, you receive the frame with its integral SEPBU
and ac power cable. All nodes, switches, and other auxiliary equipment must be
ordered separately.
4.3 Model 550 frames
The
model frame
is always the first frame in an SP system and it designates the
type or model class of your SP system. The base level Model 550 SP system has
a tall frame with eight empty node drawers and a 10.5 kW, three-phase SEPB
power subsystem.
All processor nodes and optional switches must be purchased separately for
these frames. One switch and up to sixteen thin nodes, eight wide nodes, or four
high nodes, can be installed in these frames. Other frames that connect to the
model frame are known as
expansion frames
.
Model 550 SP systems can be developed into several different configurations.
Some of these configurations use switches and some do not.
4.3.1 Model 550 non-switched configuration
This configuration consists of 1-64 processor nodes mounted in one required
Model 550 frame and in additional tall, non-switched expansion frames (F/C
1550).
Note: In order to maintain your entire SP system at the same electrical
potential, you must attach a frame-to-frame ground between all frames in your
SP system using IBM-supplied cables (P/N 46G5695).
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