IBM Power 595 Technical Overview And Introduction page 103

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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.

Close-up view of

processor node P9

4 4

2 2

3 3

1 1

Node P9

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.

System rack

I/O drawer #2

I/O drawer #1

Chapter 2. Architectural and technical overview

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