Starting with this release of Oracle Grid Infrastructure, you must configure the Grid Infrastructure Management Repository (GIMR) in a separate Oracle home, instead of in the Grid home. This option is available when you configure GIMR during a fresh Oracle Grid Infrastructure installation or you add a GIMR to an existing deployment. It is mandatory to configure GIMR in a separate Oracle home when you upgrade Oracle Grid infrastructure with an existing GIMR deployed in it.
A separate Oracle home for the GIMR ensures faster rolling upgrades, less errors, and fewer rollback situations. The Oracle Grid Infrastructure installation owner user must own the GIMR home.