About Initialization Parameter Files
Oracle recommends using the server parameter file (SPFILE) for storing Oracle Database initialization parameters.
Oracle recommends that you store all SPFILEs on Oracle ASM, including the Oracle ASM SPFILE. SPFILEs must be located on shared storage. All instances in a cluster database can access this parameter file.
See Also:
Oracle Real Application Clusters Administration and Deployment Guide for more information about the creation and use of parameter files
Parent topic: Understanding the Oracle RAC Installed Configuration