Failover clustering in Windows Server 2012 R2 provides high availability for critical workloads by automatically transferring services to healthy nodes when failures occur. Proper configuration is essential for reliable cluster operation.
Prerequisites and Cluster Validation
Before creating a cluster, ensure all nodes have identical hardware configurations, the same Windows updates installed, and access to shared storage via iSCSI or Fibre Channel. Running the Cluster Validation Wizard identifies potential issues before they become production problems.
Cluster Shared Volumes (CSV) simplify storage management by allowing multiple nodes to simultaneously access the same LUN. This is particularly beneficial for Hyper-V virtual machine deployments where live migration requires shared access to VM files.
Configure quorum settings appropriately for your node count. A two-node cluster should use a file share witness, while larger clusters can rely on node majority. Dynamic quorum adjustments in 2012 R2 improve resilience during sequential node failures.