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1-26 SPARC Enterprise M4000/M5000 Servers Overview Guide • August 2009
1.3.8 I/O Unit
The I/O unit is illustrated in FIGURE 1-18 and FIGURE 1-19. Four PCI Express (PCIe)
buses are connected from one I/O controller. These buses support all of the systems
on-board I/O controllers in addition to the interface cards in the server.
FIGURE 1-18 I/O Unit Location in the SPARC Enterprise M4000 Server
Location Number Component Maximum Number per Server
1 I/O unit 1
1