IBM Z9, Planning Manual

Page: 78 / 274

ESCD Configurations: Figure 2-10 on page 2-25 shows how shared ESCON
channels can reduce ESCD port requirements. In this example, two shared ESCON
channels replace 10 unshared (dedicated or reconfigurable) ESCON channels and
use eight fewer ESCD ports without a reduction in I/O connectivity.
LP1 LP2 LP3 LP4
C
N
C C
N
C C
N
C C
N
C
3990
LPAR
Cluster 1 Cluster 2
With shared
ESCON channels
Without shared
ESCON channels
LP1 LP2 LP3 LP4
C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C C
N
C
Cluster 1 Cluster 2
Figure 2-9. Consolidating ESCON Channels and ESCON Control Unit Ports
2-24
PR/SM Planning Guide