6. Restrict the number of channels used by queries
On the query queue managers we restrict the number of active channels used, by issuing the following commands on each:
ALTER QMGR CLWLMRUC(2)
Now that you have completed all the definitions, if you have not already done so, you should start the channel initiator on WebSphere MQ for z/OS and, on all platforms, start a listener program. The listener program listens for incoming network requests and starts the cluster-receiver channel when it is needed. See “Establishing communication in a cluster” for more information.
The cluster set up by this task looks like this:
Figure 1. The PRICECHECK cluster, with four server queue managers, two repositories and two query queue managers
Although there are four instances of the PRICEQ queue available in the PRICECHECK cluster, each querying queue manager only makes use of two of them. For example the QUERY1 queue manager only has active channels to the SERVER1 and SERVER2 queue managers. IF SERVER1 became unavailable, the QUERY1 queue manager would then begin to use another queue manager, for example SERVER3.
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