Oracle Solution for Error ora-15471

ORA-15471: volume redundancy incompatible with diskgroup redundancy

What triggered the Error:

An ADD VOLUME command specified a volume redundancy that was incompatible with the diskgroups redundancy.

What should we do to fix it:

Specify a valid volume redundancy. A volume cannot have external redundancy with a high redundancy diskgroup. Also, a volume cannot have high redundancy with an external redundancy diskgroup.