Currently I have two node Grid Infrastructure on 11.2.0.4. The node names are node1 and node2:

Now we are extracting the source files for 12.1.0.2 and make necessary folder.

Now we creating the response file for installation of new grid on both nodes.

Now we are installing grid home with response file.

After completion we get the output

Upgrade on the first node:

Log Output for Node 1

Now upgrade the second node

Log Output for Node 2

We can confirm the version

Cheers!! Upgrade done

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