IBM RS/6000 SP Problem Determination Manual page 150

5.2.2 Partitioning a Two Switch/Frame System
A maximum of two partitions only are supported in these configurations.
However, any combination is supported giving the following options:
Within all except the 32 configuration, there are many layouts possible. For
example, in the 4_28 configuration, there are 8 possible layouts. As there are 8
switch chips servicing the nodes, it is possible to choose any one of these to be
in the 4 partition.
In the 16_16 configuration, it is possible to put each frame in a separate partition,
or half of each frame in each partition, or any other combination that falls within
the basic rules.
Even with the limitation of a maximum of two partitions, there are a large
number of permutations possible. This accounts for the large number of files
present in the ssp.top product and explains why these limitations were imposed
to prevent the product becoming enormous in size. It is possible to obtain
topology files that will support a configuration that is not shipped as standard in
ssp.top, by making a special request (RPQ)
5.2.3 Partitioning a Three or More Switch/Frame System
In this configuration, a maximum of three partitions is allowed and all nodes
within a frame (or serviced by a single switch board) must be in the same
partition.
For example, in a four switch/frame system, the following are supported
configurations:
Once again, there are many layouts for all but the default single partition.
Contact your IBM representative for further details.
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SP PD Guide
Nodes Description
32 The default single partition
4_28 4 nodes in one partition, 28 in the other
8_24 8 nodes in one partition, 24 in the other
12_20 12 nodes in one partition, 20 in the other
16_16 16 nodes in each partition
Nodes Description
64 Default single partition system
16_48 1 frame in a single partition, 3 frames in the other
32_32 2 frames in each partition
16_16_32 2 partitions of 1 frame and another of 2 frames
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