Fault Tolerance with Load Balancing

You can configure Substation ES to talk to one or more Enterprise Message Service servers, a Fault Tolerant (FT) Enterprise Message Service pair, or both, and configure each of them separately within a single address space.

Substation ES, which runs as a separate address space in z/OS, communicates with Enterprise Message Service servers and hence operates as an Enterprise Message Service client.

The CICS and IMS interfaces enable Substation ES to talk to one or more BESs, making for many possible configuration permutations as shown in the following figure:

  • Configuration Tips
    The configuration tips provide information about how you can configure Enterprise Message Service servers, Substation ES address spaces, and so on to achieve a high availability environment.
  • Items to Consider
    Deploy Substation ES address spaces for an ACTIVE-ACTIVE setup and use a CICS TOR-AOR setup or CICSPlex to handle CICS dynamic routing.
  • Load Balancing with Enterprise Message Service
    Load balancing is typically achieved by combining Substation ES internal dispatching features with Enterprise Message Service load balancing techniques.