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In addition to using MQ clusters as a high availability choice (WebSphere MQ (and other messaging providers)), WebSphere MQ on z/OS can take advantage of MQ queue sharing. See Figure 8-9. A queue sharing group is a collection of queue managers on different systems in a Parallel Sysplex that have access to the same set of shared queues and to shared definitions. The WebSphere MQ queue sharing group configuration requires DB2 data sharing.
The shared WebSphere MQ object definitions are stored in DB2 tables, and messages belonging to a shared queue reside in the Coupling Facility. Two Coupling Facilities can be used in a Parallel Sysplex to prevent a single point of failure.
For more details on WebSphere MQ, see WebSphere MQ in a z/OS Parallel Sysplex Environment, SG24-6864.
Figure 8-9 WebSphere MQ queue sharing
