Planning for optimum signaling performance

Optimal signaling performance for a sysplex implies that XCF groups in the sysplex have access to the signaling resources (signaling paths and message buffers) they need to communicate in a way that meets the overall communication goals for the sysplex.

IBM® recommends using only defaults when initially setting up a sysplex and then changing values, assigning transport classes, and adding paths as you evaluate the operation of the sysplex.

To tune signaling performance, you need a way to separate XCF groups into different categories, as well as a way to associate these categories with specific signaling resources.

A transport class is MVS's way of enabling you to associate one or more XCF groups (based on similar signaling requirements) and then assign them signaling resources (signaling paths and message buffers).

To plan the signaling configuration, you need to:

Identify the XCF groups in your sysplex and consider their signaling resource requirements.
On each system, associate groups with similar signaling requirements and assign them to a transport class.
Assign to each transport class the signaling paths and message buffers to meet these signaling requirements.

This information is presented as follows: