If you have an existing Oracle Clusterware installation, then you upgrade your existing cluster by performing an out-of-place upgrade. You cannot perform an in-place upgrade.

The following topics list the steps you can perform before you upgrade Oracle Grid Infrastructure:

• Upgrade Checklist for Oracle Grid Infrastructure
  Review this checklist before upgrading an existing Oracle Grid Infrastructure. A cluster is being upgraded until all cluster member nodes are running the new installations, and the new clusterware becomes the active version.
• Checks to Complete Before Upgrading Oracle Grid Infrastructure
  Complete the following tasks before upgrading Oracle Grid Infrastructure.
• Moving Oracle Clusterware Files from NFS to Oracle ASM
  You can move Oracle Cluster Registry (OCR) and voting files from Network File System (NFS) to Oracle Automatic Storage Management (Oracle ASM) disk groups.
• Running the Oracle ORAchk Upgrade Readiness Assessment
  Download and run the Oracle ORAchk Upgrade Readiness Assessment before upgrading Oracle Grid Infrastructure.
• Using CVU to Validate Readiness for Oracle Clusterware Upgrades
  Oracle recommends that you use Cluster Verification Utility (CVU) to help to ensure that your upgrade is successful.
• Using Dry-Run Upgrade Mode to Check System Upgrade Readiness
  Use dry-run upgrade mode of Oracle Grid Infrastructure installation wizard, gridSetup.sh, to check readiness for Oracle Clusterware upgrades.