This section describes some things to consider about your queue managers when using MSCS, as follows:
For clustering to work with WebSphere MQ, you need an identical queue manager on node B for each one on node A. However, you do not need to explicitly create the second one. You can create or prepare a queue manager on one node, move it to the other node as described in Moving a queue manager to MSCS storage, and it is fully duplicated on that node.
Do not use a default queue manager under MSCS control. A queue manager does not have a property that makes it the default; WebSphere MQ keeps its own separate record. If you move a queue manager set to be the default to the other computer on failover, it does not become the default there. Make all your applications refer to specific queue managers by name.
Once a queue manager has moved node, its details exist in the registry on both computers. When you want to delete it, do so as normal on one computer, and then run the utility described in WebSphere MQ MSCS support utility programs to clean up the registry on the other computer.
You can put an existing queue manager under MSCS control, provided that you can put your queue manager log files and queue files on a disk that is on the shared SCSI bus between the two machines (see Figure 20). You need to take the queue manager offline briefly while the MSCS Resource is created.
If you want to create a new queue manager, create it independently of MSCS, test it, then put it under MSCS control. See:
You choose which queue managers are placed under MSCS control by using the MSCS Cluster Administrator to create a resource instance for each such queue manager. This process presents you with a list of resources from which to select the queue manager that you want that instance to manage.
When you move a queue manager to MSCS storage, you move its log and data files to a shared disk (for an example see Moving a queue manager to MSCS storage).
It is advisable before you move, to shut the queue manager cleanly and take a full backup of the data files and log files.
WebSphere MQ MSCS support allows you to run multiple queue managers on each machine and to place individual queue managers under MSCS control.
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