Working in Active/Active mode
Both computers in the MSCS cluster can run queue managers in Active/Active mode. You do not need to have a completely idle machine acting as standby (but you can, if you want, in Active/Passive Mode).
If you plan to use both machines to run workload, provide each
with sufficient capacity (processor, memory, secondary storage) to
run the entire cluster workload at a satisfactory level of performance.
Note: If you are using MSCS together with Microsoft Transaction
Server (COM+), you cannot use Active/Active mode. This is because,
to use WebSphere® MQ with MSCS and COM+:
- Application components that use WebSphere MQ's COM+ support must run on the same computer as the Distributed Transaction Coordinator (DTC), a part of COM+.
- The queue manager must also run on the same computer.
- The DTC must be configured as an MSCS resource, and can therefore run on only one of the computers in the cluster at any time.