High Availability
As the messaging infrastructure becomes more critical to your business, the need for a high availability configuration becomes even more important. There are three software-based solutions available with Websphere MQ; Queue Manager Clusters, Shared Queues, and Multi-Instance Queue Managers.
Queue Manager Clusters: Groups of two or more queue managers on one or more computers are defined to a cluster, providing automatic interconnection, and allow queues to be shared among them for load balancing and redundancy.
Shared Queues (z/OS only): In a Shared Queue environment, an application can connect to any of the queue managers within the queue-sharing group. Because all the queue managers in the queue-sharing group can access the same set of shared queues, the application does not depend on the availability of a particular queue manager. This gives greater availability if a queue manager stops because all the other queue managers in the queue-sharing group can continue processing the queue.
Multi-Instance Queue Managers (available in v7.0.1): Instances of the same queue manager are configured on two or more computers with their queues and meta data residing on shared storage. By starting multiple instances, one instance becomes the active instance and the other instances become standbys. If the active instance fails, a standby instance running on a different computer automatically takes over.
Read more about this topic: IBM WebSphere MQ
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