IBM Power 595, Technical Overview And Introduction

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Chapter 2. Architectural and technical overview
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– The upper connector on the I/O expansion drawer riser card will connect to the right
connector on the I/O hub adapter in the processor book.
Loop connection sequence
The I/O expansion drawer loops is cabled to the I/O hubs using an even distribution across all
of the installed processor books. The order follows the processor book plugging sequence
listed in table Table 2-1 on page 42, with the following order of priority:
1. I/O hubs are installed in bottom narrow slots across all processor nodes.
2. I/O hubs are installed in upper narrow slots across all processor nodes.
3. I/O hubs are installed in bottom wide slots across all processor nodes.
4. I/O hubs are installed in upper wide slots across all processor nodes.
This information (bottom and upper notation) is applicable regardless of the orientation of the
processor books (upper or lower). For example, bottom means bottom whether you are
plugging into an upper or lower processor book.
Figure 2-42 shows an example of the loop cabling between an I/O expansion drawer and an
I/O hub for a Power 595 server with one processor book, four I/O hubs, and two I/O expansion
drawers.
Figure 2-42 Expansion drawer to I/O hub loop cabling
Note: For ongoing management of the 595 system, it is important to keep up-to-date
cabling documentation for the internal I/O drawers. Depending on when processor books
and I/O hubs are added to your server, the cabling layout might be different from the
standard cabling diagrams provided in the installation guide.
Nod
e
P9
System rack
Node P9
1
4
2
3
I/O drawer #1
I/O drawer #2
Close-up view of
processor node P9
Nod
e
P9
System rack
Node P9
11
44
22
33
I/O drawer #1
I/O drawer #2
Close-up view of
processor node P9