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1.1 - RSF-1 Communication

Each node in the Cluster communicates with all others via a number of Heartbeat mechanisms:
NOTE - On ZFS RSF-1 Clusters, it is most common for each node to have two independent network heartbeats (one private back-to-back connection, and a public network) and two or more disk heartbeats. If disk heartbeats are not desirable (for example in all-flash configurations), then a serial heartbeat is recommended in addition to network heartbeats.
RSF-1 detects system failure when no updates from a node have been seen across all heartbeat mechanisms for a given configurable time period.
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