z/OS Communications Server: SNA Network Implementation Guide
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Coding dynamic reconfiguration changes

z/OS Communications Server: SNA Network Implementation Guide
SC27-3672-01

To add resources to a network, code the new definition statements in the required location in the VTAMLST file for the major node. To delete resources, delete the appropriate definition statements from the VTAMLST file. To move resources, move the appropriate definition statements from one location to another location in the VTAMLST file.

You can move a physical unit (and its associated logical units) from a line under one major node to a line under a different major node under the same VTAM®. To do this, delete the resources from one major node and add them to the other major node. You delete the resources with any method of dynamic reconfiguration. Make the additions in the VTAMLST file.

Some move or add operations can depend upon a delete operation completing first. For example, you could exchange resources between two major nodes at the same time (that is, move resources from the first major node to the second major node and also move resources from the second major node to the first). Or, you might delete a PU from a line and add a PU to the line with the same ADDR value as the deleted PU.

You can resolve this problem in either of these ways:
  • Make deletions with any method of dynamic reconfiguration, and then make the additions by modifying VTAMLST and issuing the VARY ACT,UPDATE=ADD command.
  • Process the source definitions twice (issue the same VARY ACT command again). The deletions will take place on the first run of the command, and the additions that failed on the first run will take place on the second run.

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