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To detect a node failure, the Cluster Manager uses a background process—Global Enqueue Service Monitor (LMON)—to monitor the health of the cluster.
When a node fails, the Cluster Manager reports the change in the cluster's membership to Global Cache Services (GCS) and Global Enqueue Service (GES).
These services are then re-mastered based on the current membership of the cluster.
CRSd - Cluster Ready Services resource monitoring, failover and node recovery