SUSPEND QMGR, RESUME QMGR and clusters

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.

Receive 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.

Parent topic: IBM MQ cluster commands

Related concepts

• Workload balancing in clusters
• Asynchronous behavior of CLUSTER commands on z/OS

Related reference

• Queue manager definition commands
• Channel definition commands
• Queue definition commands
• DISPLAY CLUSQMGR
• REFRESH CLUSTER
• RESET CLUSTER

Related information

• SUSPEND QMGR
• RESUME QMGR
• Maintaining a queue manager