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The minimum number of voting cluster members who must be present, visible and report as healthy.

When one or more cluster members stop reporting to the other of the cluster members or report as unhealthy, the existing cluster members will eject the problem member from the cluster.  A cluster member ejected from the cluster will suspend all application services to prevent data corruption by more than one system writing data without the cluster services coordinating data writes and access.  Depending on policies, VMs running on the ejected cluster member will either suspend operations or be migrated to other nodes before being ejected.