windows
(Failover Cluster) failover cluster가 어떻게 failure를 인지하는지
아이셩짱셩
2025. 5. 9. 10:24
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In a failover cluster, the failover mechanism is the process by which workloads are automatically shifted from a failing node to a healthy node in the cluster. This ensures minimal disruption to services and maintains high availability. The mechanism involves monitoring the health of each node and, upon detecting a failure, transferring the workload to another node.
Here's a more detailed explanation:
1. Monitoring and Detection:
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Heartbeat:Each node in the cluster periodically sends a heartbeat signal to other nodes, indicating its health status.
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Monitoring Software:The cluster management software continuously monitors the status of each node and the resources it manages.
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Failure Detection:If a node fails to respond or its health status becomes critical, the monitoring software detects the failure.
2. Failover Process:
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Automatic Transfer:When a failure is detected, the cluster management software automatically transfers the workload (applications, services, data) from the failed node to a healthy node.
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Resource Relocation:This may involve relocating virtual machines, databases, file shares, and other resources to the new node.
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Network and Storage:Network and storage resources are also managed to ensure seamless continuity of service.
3. Key Considerations:
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Quorum:A quorum is a mechanism that ensures the cluster can make authoritative decisions, even in the event of node failures. It helps prevent split-brain scenarios where multiple nodes believe they are the primary.
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Shared Storage:Failover clusters typically rely on shared storage, allowing multiple nodes to access the same data.
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Data Replication:Data replication ensures that the latest data is available on the standby node, enabling seamless failover.
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