Imagine, you want to do a rolling upgrade from 18.104.22.168 to 22.214.171.124…
First of all, apply patchset 9706490 to fix couple nasty bugs during ASM rolling upgrade.
Well, let’s say you shut down the Clusterware services (like I did for cleaning disk space) and you forget to start it up (well it isn’t rolling on this node if you shut it down 🙂
What happens if you run rootupgrade.sh during the Upgrade, after installing the new 126.96.36.199 binaries?
Well, nothing! This time rootupgrade.sh was smart! And no bugs in this environment after patching!
Just start up Clusterware (crsctl start crs) and rerun rootupgrade.sh and you’re good to continue!