Convert an existing cluster to a uniform cluster

We can use this procedure to convert an existing cluster to a uniform cluster.

About this task

If you convert an existing cluster to a uniform cluster, we must ensure that any definition required to support applications balancing between queue managers exists on all cluster members.

Procedure

1. Enable IBM MQ publish subscribe, including remote (clustered) publish subscribe on all queue managers. This is a prerequisite to uniform cluster functionality, so we must ensure that the PSMODE and PSCLUS attributes of the queue manager are both set to the default value of ENABLED.
2. Add an AutoCluster section to the qm.ini file to the name of the IBM MQ cluster, as used in your MQSC object definitions, such as cluster channels. For example, if the name of the cluster is UNICLUS, add or modify the AutoCluster stanza in your qm.ini files as follows:

   AutoCluster:
         ClusterName=UNICLUS
   	Type=Uniform
   

3. Restart the queue managers to apply the new setting.
4. Consider using automatic configuration as a mechanism for ensuring all uniform cluster members have the same configuration applied from startup. See Automatic configuration from an MQSC script at startup for more details.

Parent topic: Create a uniform cluster

Related concepts

• About uniform clusters
• Limitations and considerations for uniform clusters