IBM Z9, Planning Manual

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production CPCs fails, you could transfer the logical paths from the failing CPC to
the backup CPC by prohibiting the dynamic connection to the failed CPC and
allowing the dynamic connection to the backup CPC.
If a control unit is connected to more than one Director, it is necessary to coordinate
allocation of the control unit’s logical paths across all of the Directors. You can use
the System Automation for z/OS (SA z/OS) to dynamically manage the Directors
and logical paths by sending SA z/OS commands to reconfigure one or more
Directors. SA z/OS then sends the appropriate operating system Vary Path
requests. SA z/OS can also provide coordination between operating systems when
logical paths are removed from one system and transferred to another system as a
result of blocking Director ports or prohibiting Director dynamic connections or
communication.
3990
Cluster 1 Cluster 2
Dashed lines indicate dynamic
connections between ports that
were initially prohibited.
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ESCD
Production
CPC1
Production
CPC2
Production
CPC3
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CPC4
Backup
CPC5
Figure 2-7. Using the ESCD to Manage Logical Paths by Prohibiting Dynamic Connections
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PR/SM Planning Guide