Queue managers, with different names, can coexist on any server as long as they use the
same IBM MQ installation. On
z/OS®,
UNIX, Linux , and Windows, different queue managers can coexist on the same server and be associated with different
installations. In addition to queue managers coexisting on a server, objects, and commands must work correctly with different queue managers running at different command levels.
Multiple queue manager versions in z/OS
There can be several IBM MQ subsystems in a z/OS image, and they can use different versions of IBM MQ, provided that the IBM MQ early code modules are of the latest version being used. (These modules are loaded at z/OS IPL time and are shared among all the IBM MQ subsystems in the z/OS image.)
This means that we can run one queue manager at the latest version and another in the same image with an earlier version, provided that the early code is that of the latest version.
The coexistence section lists restrictions in the use of objects and commands when they are used with queue managers at multiple command levels. The queue managers might be running on a single server, or in a cluster.