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Chapter 12. Performance considerations 269
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.
Processor
Memory
Processor
L1,2
Memory
L3
Memory
L1,2
Memory
RIO-G Module
SERVER 0
Processor
Memory
Processor
L1,2
Memory
L3
Memory
L1,2
Memory
RIO-G Module
SERVER 1
DA
RIO-2 Interconnect
o
oo
20 port switch
20 port switch
16 DDM
o
oo
20 port switch
20 port switch
16 DDM
DA
IBM
DAs with an affinity to server 0
FC1
HA
HAs don't have DS8000 server affinity
Extent pool 1
LUN1
LUN1
LUN1
Extent pool 1
controlled by server 0
oooo
Extent pool 4
controlled by server 1
FC0
I/Os
I/Os
Reads
Reads
DAs with an affinity to server 1
Extent pool 4