This illustration shows how security keys for specific clients are stored in individual cellkey.ora files. On the top, right-side of the image, there is a box illustrating the command to generate a security key:

Cellcli> CREATE KEY

Below this box, there are 3 generated keys:

The key for the PeopleSoft database is assigned to the cellkey.ora file that is located on the database server in the PeopleSoft DB Home. The key for the Oracle EBS database is assigned to the cellkey.ora file that is located on the database server in the Oracle EBS DB Home. The key for the Oracle ASM disks is assigned to the cellkey.ora file that is located in the Oracle Grid Infrastructure Home.