How to Fix Oracle RAC 19c Installation Error: [INS-20802] Oracle Cluster Verification Utility Failed

During an Oracle Grid Infrastructure installation, encountering the [INS-20802] Oracle Cluster Verification Utility failed error can be a major roadblock. This error usually appears when the installer’s integrated CVU pre-check fails due to a missing prerequisite or a temporary environmental issue.

Fortunately, there’s a simple and effective workaround that allows you to verify prerequisites manually and proceed with your Oracle RAC installation without delays.

The Workaround: Manual Verification with cluvfy

The key to resolving this issue is to bypass the installer’s internal CVU check and perform the verification manually. If the manual check succeeds, it confirms that all prerequisites are indeed met and you can safely ignore the installer’s error.

Steps to Perform Manual Verification

• Open a terminal on your Grid Infrastructure server.
• Navigate to the bin directory of your Oracle Grid home.
• Run the cluvfy command with the appropriate stage and verbose options.

Example command to check the post-installation status for cluster services:

[grid@testdb03 bin]$ ./cluvfy stage -post crsinst -n testdb03,testdb04 -verbose

Expected Output on Success

Post-check for cluster services setup was successful.

CVU operation performed: stage -post crsinst
Date: Feb 25, 2025 11:34:17 PM
CVU home: /u01/app/19.0.0/grid_home/
User: grid

Tip: If your manual cluvfy command runs without any errors and shows a successful result, you can continue with your Oracle Grid Infrastructure installation. The installer’s previous error was likely a temporary glitch.

Why This Works

The installer uses its internal CVU to validate prerequisites, but sometimes environmental timing issues, DNS hiccups, or temporary resource bottlenecks trigger a false negative. By running cluvfy yourself, you directly test the same prerequisites without the installer’s overhead.

Key Takeaways

• Always verify prerequisites manually if the installer shows [INS-20802].
• Ensure SSH equivalency, correct DNS entries, and shared storage availability before running cluvfy.
• If cluvfy passes, it’s safe to proceed with the installation.

Reference: See Oracle’s official documentation on Oracle Grid Infrastructure Installation and Upgrade Guide for more details.

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