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# Cluster Size

For delivery assurance with fault tolerance, use a minimum cluster size of 3 services, so that a quorum can exist even when one service is unavailable.

For replication, use a minimum cluster size of 3 services.

A cluster of 2 services is invalid, because when one service is unavailable, the remaining service cannot form a quorum on its own. It is an error to configure only 2 services.

For apportioning message streams, a cluster of only 1 service is a valid configuration.

Similarly, a message broker cluster of only 1 service is a valid configuration.

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TIBCO FTL® - Enterprise Edition

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