How a WSFC Default Setting Triggered a P0 SQL Server Outage

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This article describes a critical SQL Server Failover Cluster incident caused by a default “Add all eligible storage” setting during node addition and subsequent run validate cluster tool, which led to a DB crash and failover failure, and outlines a detailed step-by-step recovery process and preventive method to avoid mission critical outages.

Incident overview. In enterprise architecture, a Severity 1 / Priority 0 (P0) incident represents the highest level of business disruption—a total system blackout where all end-users are completely down and revenue-generating operations grind to a halt.

High-availability design is meant to protect systems from failure, but configuration oversights during infrastructure scaling can inadvertently cause the exact outages they are built to prevent.

In this article, I break down a real-world production incident involving a SQL Server Failover Cluster Instance (FCI) running on Windows Server Failover Clustering (WSFC). Discover why an administrative wizard checkbox triggered an immediate crash into...

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