directIOfor file read and write operations in 11g Release 2 (11.2).
Oracle ACFS is the preferred file manager for non-database files. It is optimized for general purpose files.
Oracle ACFS does not support files for the Oracle grid infrastructure home.Oracle ACFS does not support Oracle Cluster Registry (OCR) and voting files.
Oracle Automatic Storage Management Cluster File System (Oracle ACFS) is a multi-platform, scalable file system, and storage management technology that extends Oracle Automatic Storage Management (Oracle ASM) functionality to support customer files maintained outside of the Oracle Database. Oracle ACFS supports many database and application files, including executables, database trace files, database alert logs, application reports, BFILEs, and configuration files. Other supported files are video, audio, text, images, engineering drawings, and other general-purpose application file data.