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
  If Oracle Cluster Registry (OCR) and voting files are stored on Network File System (NFS), then move these files to Oracle ASM disk groups before upgrading Oracle Grid Infrastructure.
• Running the Oracle ORAchk Upgrade Readiness Assessment
  Download and run the 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.