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You connect additional hosts to the DS4500 Storage Subsystem by adding
host-side mini hubs and fibre channel switches (one fibre channel switch for each
mini hub).
Figure 80 shows an example of dual path configuration using fibre channel
switches. Host 1 contains two host bus adapters that are connected to host mini
hubs. To configure a host with dual path redundancy, connect the first host bus
adapter (HA1) to SW1 and connect the second host bus adapter (HA2) to SW2.
Then, connect SW1 to host mini hub 1 and SW2 to host mini hub 2.
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You can directly attach up to four fibre channel switches (one per mini hub) to a
DS4500 Storage Subsystem. Figure 81 shows an example of attaching four fibre
channel switches.
Figure 80. Using two fibre channel switches to connect a host
Figure 81. Using four fibre channel switches to connect multiple hosts
108 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide