How to upgrade to Oracle Real Application Clusters (RAC) 19c with ZERO DOWNTIME?

Here is a very useful blog post by Anil Nair Oracle Senior Principal Product Manager on How to upgrade to Oracle Real Application Clusters (RAC) 19c with ZERO DOWNTIME?

Here is a quick recap on this topic:

• Upgrade to RAC 19c requires Linux 7.
• Running ./gridSetup on OS version < Linux 7 will result in an error.
• Performing a series of Delete Node, Upgrade & Add Node Operations = Upgrade OS & Grid Infrastructure (GI) at the same time without Downtime (Pretty Cool Stuff).
• Alternative Upgrade Paths.

The entire presentation by Anil can be found here.

Cheers.