Use the SUSPEND QMGR and RESUME QMGR command to temporarily reduce the inbound cluster activity to this queue manager, for example, before you perform maintenance on this queue manager, and then reinstate it.

While a queue manager is suspended from a cluster, it does not receive messages on cluster queues that it hosts if there is an available queue of the same name on an alternative queue manager in the cluster. However, messages that are explicitly targeted at this queue manager, or where the target queue is only available on this queue manager, are still directed to this queue manager.

Receiving further inbound messages while the queue manager is suspended can be prevented by stopping the cluster receiver channels for this cluster. To stop the cluster receiver channels for a cluster, use the FORCE mode of the SUSPEND QMGR command.