IBM Z9, Руководство по планированию

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Configuring Offline Unneeded Channels or Shared Channels on an LP Basis:
You can configure offline unneeded channels or shared channels on an LP basis to
manage how logical paths are established. In Figure 2-4 on page 2-15, all five LPs
need to be active concurrently. If all five LPs had each of the four shared ESCON
channels configured online, 20 logical paths (four logical paths for each of the five
LPs) would be requested, exceeding the 3990’s logical path capacity.
However, if LP4 or LP5 (both test LPs) did not require four channel paths each to
the 3990, you could configure offline two of the four channel images used by LP4
and two of the four channel images used by LP5, reducing the total number of
logical paths requested from 20 to 16 and matching the 3990’s logical path capacity.
LP1 LP2 LP3 LP4 LP5
CHP
30
CHP
31
CHP
32
CHP
33
3990
LPAR
Cluster 1 Cluster 2
Production Production Production Test Test
Each shared ESCON
LP1, LP2, and LP3
are activated.
LP4 and LP5:
one activated and
one deactivated.
channel establishes 4
logical paths to the 3990.
Figure 2-3. Deactivating Unneeded Logical Partitions
2-14
PR/SM Planning Guide