Here I would be discussing how to upgrade Oracle 11gR2 ( Grid Infrastructure to Oracle 18c ( on the same server. This upgrade process was done on Linux 7 (x86_64).

  1. Before the GI upgrade backup the OCR manually. This could be used in downgrading the GI from to later one. If you want to know how we install the database to 18c click here.
  2. Download the Oracle Grid Infrastructure image file, create the Grid home directory, and extract the image files in this Grid home directory.

Unzipping the 18c Grid binaries

Before the upgrade check GI active version is and upgrade state

Verify the prerequisites with “runcluvfy”. Full log attached here: cluvfylog

While pre-checking I found there were some prerequisites missing.

  • In 18c, we need 8GB of RAM per node, as I have my test lab, so I will go to ignore this.
  • There was a bug on NTP (PRVG-13602) confirmed by support with bug number (24314803) but unfortunately this bug fix is not released, they confirmed to ignore this and go further.
  • There is must be July 2017  PSU or later installed before proceeding for upgrading.

Run the installer and select upgrade GI to continue the upgrade on OUI.
Starting with Oracle Grid Infrastructure 12c Release 2 (12.2), the Oracle Grid Infrastructure software is available as an image file for download and installation. You must extract the image software into the directory where you want your Grid home to be located, and then run the script to start the Oracle Grid Infrastructure installation.

To use upgrade Oracle Grid Infrastructure for a cluster:

Start the Grid Setup Wizard:

On the Select Installation Option page, select Upgrade Oracle Grid Infrastructure.

On the Oracle Grid Infrastructure Node Selection page, review the nodes you want to upgrade. Additionally, you can choose not to upgrade nodes that are down.
Continue adding your information on the remaining wizard pages.

As I told earlier we can ignore NTP related issues.

For the output log, RootUpgrade.log

After the upgrade, we can the status of software version and CRS

Cheers!!! we completed the upgrade from 11gr2 to 18c.

Next, we can upgrade the Oracle database 11204 to 12201 manually or with DBUA

Stay tuned for More articles on Oracle 18c 

Thank you for giving your valuable time to read the above information.

If you want to be updated with all our articles send us the Invitation or Follow us:

Skant Gupta’s LinkedIn:

Joel Perez’s LinkedIn: Joel Perez’s Profile

Anuradha’s LinkedIn: Anuradha’s Profile

LinkedIn Group: Oracle Cloud DBAAS

Facebook Page: OracleHelp

About The Author


  1. Rohan

    Good thing is that you have shared cluvfylog along with the blog post. This will be helpful during VM upgrade for the installer. Currently I have 3 Gb Physical memory allocated to VM . I will make it 8 Gb and will start the Upgrade.

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.