How to apply patches in SQL Server SQL Cluster Environment:

 SQL Cluster Environment:

Apply a SQL Service Pack or hot-fix in a 2 node Active/Passive SQL Cluster environment.

Active SQL Server: SQLDBANOWDBALABS

Passive SQL Server: SQLDBANOWDBALABS-DR

1. First apply the SQL Service Pack on Passive Server. (SQLDBANOWDBALABS-DR)

2. Post SP/hot-fix installation completion, restart the Passive Server if prompted.

3. Failover the SQL Cluster Service/Instance from Active to Passive Server.

Post Failover:

New Active Server: SQLDBANOWDBALABS-DR

New Passive Server: SQLDBANOWDBALABS

4. Now apply the SQL Service pack on New Passive Server. (SQLDBANOWDBALABS)

5. Post SP/hot-fix installation completion, restart the New Passive Server if prompted.

6. Failback the SQL Cluster Service/Instance from Active to Passive Server.

Post Failback:

Active Server: SQLDBANOWDBALABS

Passive Server: SQLDBANOWDBALABS-DR

7. Finally verify the SQL Cluster Services and Cluster Disk Health Check in Failover Cluster Manager.

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