IBM manual DS8000 switched FC-AL implementation, Disk enclosure switched connections

	Switched connections
server 0	Fibre channel switch	server 1
device		device
adapter	Fibre channel switch	adapter

Figure 2-12 Disk enclosure switched connections

DS8000 switched FC-AL implementation

For a more detailed look at how the switched disk architecture expands in the DS8000 you should refer to Figure 2-13 on page 35. It depicts how each DS8000 device adapter connects to two disk networks called loops. Expansion is achieved by adding enclosures to the expansion ports of each switch. Each loop can potentially have up to six enclosures, but this will vary depending on machine model and DA pair number. The front enclosures are those that are physically located at the front of the machine. The rear enclosures are located at the rear of the machine.

34DS8000 Series: Concepts and Architecture