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ESCON CTC Configurations: Figure 2-11 shows how shared ESCON channels
can reduce the ESCON channel requirements for ESCON CTC configurations. In
this example, the CPC requires CTC communications among all its LPs.
LP1
LP2
LP3
C
C
C
C
C
T
N
T
N
T
C
C
C
C
C
ESCD
Figure 2-11. Consolidating ESCON Channels Used for ESCON CTC Communications
By using two shared ESCON CTC/CNC pairs (4 shared ESCON channels), you
can:
v Replace five unshared ESCON CTC/CNC pairs (10 unshared ESCON channels)
v Provide full redundancy
I/O connectivity is maintained while hardware requirements (channels and an
ESCD) are reduced.
2-26
PR/SM Planning Guide
LP4
LP5
LP5
C
C
C
C
C
N
T
N
T
N
C
C
C
C
C
Without shared
ESCON channels
With shared
ESCON channels
and the ESCD used to connect them
LP1
LP2
LP3
LPAR
C
C
T
N
C
C
Two channel pairs (CTC to CNC)
provide redundancy to enhance
availability.
Similar channel savings can be
achieved with multiple MIF
processors.
LP4
LP5
C
C
T
N
C
C
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