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Installing SQL Server 2025 on Failover Cluster over Windows Server 2019

Two-node SQL Server Failover Cluster Instance (FCI) deployment, role validation, connection by virtual name, and SSMS 22 installation. Also applies to Windows Server 2022 and Windows Server 2025.

SQL Server 2025Windows Server 2019Windows Server 2022Windows Server 2025
Language
Spanish
Last updated
2026-07-28
Level
Advanced
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Summary

Problem it solves

Install SQL Server 2025 as a two-node Failover Cluster Instance on an already-prepared WSFC (Windows Server 2019, 2022, or 2025), without Network Name errors, shared storage issues, or a role that fails to come Online.

Who it is for

Infrastructure DBAs and high-availability engineers installing SQL Server 2025 as an FCI on an already-prepared WSFC on Windows Server 2019, 2022, or 2025.

Who it is not for

Anyone who needs to prepare the WSFC from scratch (Active Directory, quorum, cluster disks) or is looking for a standalone installation — see the standalone SQL Server 2025 installation guide.

What's included

  1. Summary, scope, and verifiable objectives
  2. Technical sheet and lab architecture
  3. Preparation and prerequisites (existing WSFC, Disk Witness, accounts)
  4. Installing the first node (FCI) and adding the second node
  5. Installing SQL Server Management Studio 22
  6. Final validation: role Online, connection by virtual name, and failover
  7. Common precheck errors and diagnosis
  8. Rollback plan for a partial or failed installation

Technical information

Engines
SQL Server 2025, Windows Server 2019, Windows Server 2022, Windows Server 2025
Operating systems
Windows Server 2019, Windows Server 2022, Windows Server 2025
Tools
Failover Cluster Manager, SQL Server Configuration Manager, SSMS
Level
Advanced
Estimated duration
3-4 hours
Prerequisites
Windows Server Failover Cluster (WSFC) already validated (Cluster Validation with no critical errors), Shared storage (Disk Witness and data disks) visible on both nodes, Domain service account and permissions to create the Cluster Name Object (CNO) in Active Directory

Included files

  • Evidence collection script (PowerShell: cluster logs and Failover Clustering events)

Lab evidence

Procedure executed in a real two-node lab (Windows Server 2019, existing WSFC) and documented with lab evidence: creating the FCI on node 1, adding node 2, role validation, connection by virtual name, and a test failover. Fine-tuning memory, MAXDOP, TempDB, and backups is out of scope — it will be published separately as an FCI best-practices manual.

Licenses

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Version history

  • 1.0 — 2026-07-28: First published edition: complete two-node FCI installation procedure, final validation, errors and fixes, and rollback plan.

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Installing SQL Server 2025 on Failover Cluster over Windows Server 2019

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