cluster quorum

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Storage

A dynamically calculated majority used to determine whether any grouping of nodes is sufficient to start or run the cluster. Cluster quorums prevent split-brain syndrome which can lead to data corruption or inconsistency. Currently at least 50% of the nodes plus a tie-breaker are required for a quorum. If no tie-breaker is configured, then greater than 50% of the nodes is required to start and run a cluster.

HP — Designing Disaster Tolerant High Availability Clusters