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Load balance is a high-availability (HA) scheme, where the service calls direct to one of many service providers, in this case a Message Queue manager, such that it is likely that one is available and ready for access. Fault-tolerance (FT) is about what happens when one of the MQ managers dies unexpectedly, and does it lose the messages that were enqueued there. In my experience, FT with MQ is harder to do, and requires duplication of the MQ manager state in some fashion.

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Q: Difference between fault tolerance and load balance in websphere MQ?
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