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# Quorum Conditions: General Rule

A valid quorum ensures correct replication and fault tolerance. As a general rule, a group of candidate services must satisfy all three of the following conditions to form a valid quorum.

(For special exceptions, see Quorum Behaviors.)

- Majority: The number of candidate services that satisfy these conditions must be strictly greater than half of the number of services in the cluster definition (that is, a simple majority).
- Reachable: A majority of the defined services must be running and able to communicate with one another.
- Non-Empty: A majority of the defined services must be non-empty. (A service is empty when it starts or restarts without loading saved state. A service that has successfully joined a quorum is no longer empty.)

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