Silicon Graphics 2400, Owner'S Manual

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Chapter 4: System Configurations
Note: It is possible for a configuration to have between 4 and 32 processors. The 16P and
32P configurations are used because they represent the maximum number of processors
for one- or two-rack systems.
The configuration shown in Figure 4-7 uses Xpress links to increase the transmission
throughput between modules and racks. The Xpress links provide additional data
routing, which reduces potential transmission latency.
In Figure 4-7, all the available router ports are used. To go beyond a 32 processor
configuration, the Xpress links must be removed and more CrayLink Interconnect cables
must be installed. Figure 4-8 represents a 64P configuration which is simply a double of
the previous 32P system.
Figure 4-6 32P Configuration
Node
boards
Router
boards
R1 R2
R3 R4
R1 R2
R3 R4