Super member support for IMS-to-IMS communications

You can use the OTMA super member function to distribute messages sent to a remote IMS system across multiple local instances of IMS Connect.

OTMA distributes IMS-to-IMS messages in turn to each IMS Connect instance in the super member group by using a round-robin distribution algorithm. If an IMS Connect instance joins or leaves the super member group, OTMA dynamically updates the super member round robin list.

OTMA supports up to eight tmembers in a super member group that is used for IMS-to-IMS TCP/IP communications. OTMA counts each connection defined by an IMS Connect DATASTORE configuration statement as a tmember. The tmember limit can be reached by eight or fewer IMS Connect instances, depending on how many DATASTORE connections each IMS Connect instance establishes with the same super member group.

If more than eight tmembers are defined to use a super member group, OTMA uses only the first eight to join the super member group.

Figure 1. Using a super member group with OTMA IMS-to-IMS TCP/IP connections
Begin figure description: An OTMA destination descriptor defines a super member group called SM01 in a local IMS system, IMS1. OTMA in IMS1 routes output messages to three local IMS connect instances, each of which specify SMEMBER=SM01 on their DATASTORE statements. One remote IMS Connect instance receives the output messages from all three local IMS Connect instances and passes them to the remote IMS system, IMS2.