IBM DS8000 manual Performance and sizing considerations for z/OS, Connect to zSeries hosts, 269

					IBM
				Reads
				Reads
		HAs don't have DS8000 server affinity
			HA	LUN1
				FC0	FC1
			I/Os			I/Os
	L1,2							L1,2
Memory	Memory	Processor
							Processor	Memory	Memory
	SERVER 0
			RIO-2 Interconnect				SERVER 1
	L1,2
L3								L1,2
Memory	Memory	Processor					Processor		L3
								Memory	Memory
	RIO-G Module		Extent pool 1			Extent pool 4
				20 port switch			RIO-G Module
					16 DDM
				LUN1	ooo
				20 port switch
	DA			20 port switch				DA
DAs with an affinity to server 0				LUN1	ooo		DAs with an affinity to server 1
					16 DDM
				20 port switch
			Extent pool 1		oooo	Extent pool 4
			controlled by server 0			controlled by server 1

Figure 12-11 Dual port host attachment

12.5 Performance and sizing considerations for z/OS

Here we discuss some z/OS-specific topics regarding the performance potential of the DS8000. We also address what to consider when you configure and size a DS8000 to replace older storage hardware in z/OS environments.

12.5.1 Connect to zSeries hosts

Figure 12-12 on page 270 displays a configuration fragment on how to connect a DS8000 to FICON hosts.

Chapter 12. Performance considerations 269