Grid Clusterware 26ai 2 node RAC upgrade from 19c rolling forward

 

Step 1. Downloading software and preparation

Step 2. Update your linux and install oracle preinstall rpm

Step 3. Setup new home and prechecks

STEP 4. UPGRADE

Step 5. Verifying configuration

 

Step 1. Downloading software and preparation

 

 

Extract the Zip file

Command :- 

/applications/oracle/g19.3.0/grid_home_26ai/runcluvfy.sh \
stage -pre crsinst -upgrade -rolling \
-src_crshome /applications/oracle/g19.3.0/grid_home \
-dest_crshome /applications/oracle/g19.3.0/grid_home_26ai \
-dest_version 23.26.1.0.0 \
-fixup -verbose

Command Breakdown

1. runcluvfy.sh

This is Oracle’s Cluster Verification Utility (CVU) script.

It is used for:

• Pre-check validation
• Post-check validation
• Cluster verification
• Upgrade readiness checks

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2. stage -pre crsinst

Meaning:

Pre-check before CRS installation or upgrade

CRS stands for:

Cluster Ready Services

This option runs prerequisite checks before the Grid Infrastructure installation or upgrade process.

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3. -upgrade

This indicates that:

• It is not a fresh installation
• An existing Oracle Grid Infrastructure environment is being upgraded

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4. -rolling

This is a very important option.

Meaning:

Rolling upgrade validation

Oracle verifies whether:

• The upgrade can be performed one node at a time
• Cluster downtime can be avoided during the upgrade

Example

Upgrade Node1
Cluster continues running

Upgrade Node2

This allows high availability during the upgrade process.

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5. -src_crshome

-src_crshome /applications/oracle/g19.3.0/grid_home

This specifies the current (old) Grid Infrastructure home.

It is the source Grid Home from which the upgrade will occur.

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6. -dest_crshome

-dest_crshome /applications/oracle/g19.3.0/grid_home_26ai

This specifies the new Grid Infrastructure home.

This is the location where the new Oracle Grid Infrastructure software is installed.

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7. -dest_version 23.26.1.0.0

This specifies the target upgrade version.

Oracle validates whether:

• The current Grid Infrastructure version can be upgraded to the target version
• The upgrade path is supported

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8. -fixup

This is a very useful option.

Oracle attempts to automatically fix certain prerequisite issues.

Examples include:

• Kernel parameter settings
• Operating system configurations
• Missing package requirements
• Permission-related issues

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9. -verbose

Enables detailed output.

Oracle displays the detailed status of every validation check.

Example Output

PASSED
FAILED
WARNING

This helps DBAs identify exactly which checks succeeded or failed.

STEP 4. UPGRADE

Go to Node 1 (26ai) home and you will get gridSetup.sh 

Run the gridSetup.sh for upgradataion 

In the OUI GUI, select “Upgrade Oracle Grid Infrastructure” and click Next → Next through the wizard. When prompted, the installer will ask you to run rootupgrade.sh as root — do not close this window, proceed to Step 3.

[root@ora11t ~]# . oraenv

ORACLE_SID = [root] ? +ASM2

The Oracle base has been set to /applications/oracle/g19.3.0/grid_base

[root@ora11t ~]# rpm -qa | grep compat-openssl

[grid@ora10t trace]$ su - root

Password:

[root@ora10t ~]# . oraenv

ORACLE_SID = [root] ? +ASM1

The Oracle base has been set to /applications/oracle/g19.3.0/grid_base

[root@ora10t ~]# rpm -qa | grep compat-openssl

compat-openssl10-1.0.2o-4.el8_10.1.x86_64

Run -->  yum install -y compat-openssl10 on ora11t

Run rootupgrade.sh — both RAC nodes

Step 5. Verifying configuration

We have successfully upgraded the Grid Infrastructure from 19c to 23ai in rolling mode.