Defining an IMS Connect super member group for OTMA IMS-to-IMS TCP/IP connections

Using a super member group, you can configure OTMA to send output messages to a remote IMS installation through up to eight local instances of IMS Connect.

The use of a super member group is transparent to both the IMS application that sends the messages and the remote IMS installation that receives the messages.

The following figure illustrates the use of a super member group with an IMS-to-IMS TCP/IP connection.

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.

To configure a super member group to send OTMA ALTPCB messages to a remote IMS installation by way of an IMS-to-IMS TCP/IP connection:

Procedure

  1. Define an OTMA destination descriptor in the DFSYDTx member of the IMS.PROCLIB data set that includes the following specifications:
    • SMEM=YES, to enable a super member group.
    • TMEMBER=super_member_name, to name the super member group. For example, TMEMBER=SM01.
  2. In the IMS.PROCLIB data set, specify SMEM=super_member_name in the DATASTORE statement of the configuration member for each local IMS Connect instance that participates in the super member group. For example, if the super member group is named SM01, specify SMEM=SM01 for each IMS Connect instance.
  3. Modify the IMS application program to specify the OTMA destination descriptor that you defined as the destination for the output messages that it sends to the remote IMS system.
After the super member group is defined and the IMS application begins sending output messages, OTMA distributes the output messages to each participating IMS Connect instance in turn by using a round-robin algorithm.

OTMA dynamically updates the super member round robin list each time an IMS Connect instance joins or leaves the super member group.