2.1.4System Bus

The CMU containing a CPU and memory subsystem and each component in an IOU containing an I/O subsystem are used for high-throughput data transfer between all components through a crossbar switch. The crossbar switch has duplicated bus routes. If one crossbar switch has an error, the system can be restarted to isolate the faulty switch, enabling the high-end servers to continue operation.

FIGURE 2-1shows data transfer in the system.

Chapter 2 System Features 2-3