You can create clusters that overlap, as described in Putting across clusters. There are a number of reasons you might do this, for example:
In Figure 11 the queue manager QM2 is a member of both the clusters illustrated. When a queue manager is a member of more than one cluster, you can take advantage of namelists to reduce the number of definitions you need. A namelist can contain a list of names, for example, cluster names. You can create a namelist naming the clusters, and then specify this namelist on the ALTER QMGR command for QM2 to make it a full repository queue manager for both clusters. See Task 7: Adding a new, interconnected cluster for some examples of how to use namelists.
If you have more than one cluster in your network, you must give them different names. If two clusters with the same name are ever merged, it will not be possible to separate them again. It is also a good idea to give the clusters and channels different names so that they are more easily distinguished when you look at the output from DISPLAY commands. Queue manager names must be unique within a cluster for it to work correctly.
Imagine a university that has a queue manager for each member of staff and each student. Messages between members of staff are to travel on channels with a high priority and high bandwidth. Messages between students are to travel on cheaper, slower channels. You can set up this network using traditional distributed queuing techniques. WebSphere MQ(R) knows which channels to use by looking at the destination queue name and queue manager name.
To clearly differentiate between the staff and students, you could group their queue managers into two clusters as shown in Figure 16. WebSphere MQ will move messages to the meetings queue in the staff cluster only over channels that are defined in that cluster. Messages for the gossip queue in the students cluster go over channels defined in that cluster and receive the appropriate class of service.
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