For database files and related files, determine whether you require one file system for each database or multiple file systems for each database.
For simplicity of configuration and maintenance, create one file system to store these files for all Oracle RAC instances of the database.
To facilitate future expansion, create multiple file systems to store these files for all Oracle RAC instances of the database.
If you are adding storage for an existing database, you must create additional file systems for the storage that you are adding. In this situation, distribute the database files and related files among the file systems that you will use for the database.
Each file system that you create for database files and related files must have its own metadata server. For information about the resources that are required for the metadata servers, see Resources for the Sun StorageTek QFS Metadata Server.
The database files and related files are as follows:
Online redo log files
Archived redo log files
Flashback log files
Oracle cluster registry (OCR) files
Oracle CRS voting disk