opatchauto with out-of-place not behaving as advertised
While trying to patch GI from 18.3.0 to 18.10.0 (as well as databases) I tried the automated out-of-place method (OOP) provided with opatchauto. This is an intermediate action in order to jump to the current 19.7.0 version.
I decided to use the two-steps method: first prepare-clone, second switch-clone, but failed preparing the clone.
/u01/app/18.3.0/grid ==> /u01/app/18.10.0/grid
/u01/app/oracle/product/18.3.0/dbhome_1 ==> /u01/app/oracle/product/18.10.0/dbhome_2
Using this method, files of every Oracle Home are copied to a new path, cloned (registered in the inventory), and patched in the cloned path. The next step would be the switch to this Oracle Home.