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3: System Overview
Figure 3-1 SGI Altix 450 System (Short Rack)
System Models
The basic enclosure within the Altix 450 system is the 5U high (8.68 inch or 22 cm) “individual
rack unit” (IRU). The IRU enclosure houses a maximum of four single-wide blades and one
double-wide blade. Each IRU comes with two built-in high-speed routers. The routers connect to
the installed blades via a backplane. Each router has two ports that are brought out to external
NUMAlink 4 connectors. The 20U or 42U rack for this server houses all IRU enclosures, option
modules, and other components; up to a 76-processor core configuration (38 processor sockets) in
a single rack. The Altix 450 server system needs a minimum of one IA/IA2 blade (base I/O).
The rack system requires a minimum of one 20U-high rack with one single-phase power
distribution unit (PDU) installed in the rack. Each single-phase PDU has 5 outlets (to support two
IRUs).
Figure 3-2 shows an example configuration of a 42U Altix 450 system “tall rack.”