failover clusters

The failover clusters tag covers guidance for planning and managing clustered Windows Server environments, with particular attention to upgrade decisions. Current coverage focuses on Windows Server 2016 systems approaching the January 12, 2027 support deadline and explains why failover clusters should be treated as separate, multistage projects rather than handled like nonclustered installations. Topics include assessing direct upgrade eligibility, choosing migration or rebuild paths, and accounting for unsupported roles, aging hardware, application uncertainty, and configuration changes. This archive is useful for administrators evaluating lower-risk modernization strategies for failover clusters while aligning server workloads, infrastructure condition, and Microsoft’s current upgrade guidance.