Queue sharing groups and clusters

Shared queues can be cluster queues and queue managers in a queue sharing group can also be cluster queue managers.

On IBM MQ for z/OS we can group queue managers into queue sharing groups. A queue manager in a queue sharing group can define a local queue that is to be shared by up to 32 queue managers.

Shared queues can also be cluster queues. Furthermore, the queue managers in a queue sharing group can also be in one or more clusters.

In IBM MQ for z/OS, we can define VTAM generic resources or Dynamic Domain Name Server (DDNS) generic names. We can define connection names using generic names. However, when you create a cluster-receiver definition, do not use a generic connection name.

The problem with using generic connection names for cluster-receiver definitions is as follows. If you define a CLUSRCVR with a generic CONNAME there is no guarantee that your CLUSSDR channels point to the queue managers you intend. Your initial CLUSSDR might end up pointing to any queue manager in the queue sharing group, not necessarily one that hosts a full repository. If a channel starts trying a connection again, it might reconnect to a different queue manager with the same generic name disrupting the flow of messages.

Parent topic: Designing clusters