Oracle Cloud File System
Oracle Cloud File System (ACFS/ADVM)
Oracle Cloud File System (CloudFS) is a storage management suite developed by Oracle Corporation. CloudFS consists of a cluster file system called ASM Cluster File System (ACFS), and a cluster volume manager called ASM Dynamic Volume Manager (ADVM) initially released in August of 2007.
Features
ACFS is a standard-based POSIX (Linux, UNIX) and Windows cluster file system with full cluster-wide file and memory mapped I/O cache coherency and file locking. ACFS provides direct I/O that is better suited for Oracle database I/O workloads. ACFS implements indirect I/O however for general purpose files that typically perform small I/O for better response time. CloudFS is designed to scale to billions of files and supports very large file and file systems sizes (up to exabytes of storage).
CloudFS is built on top of Oracle Automatic Storage Management (ASM) and Oracle clustering technologies to provide cluster volume and file services to clients. ADVM and ACFS leverage ASM striping, mirroring and automatic I/O rebalancing features to manage volumes that are dynamically resizable.
Initially, CloudFS was designed as a general purpose file system for non Oracle database files only. With the latest release in Oracle Database 12c, ACFS supports Oracle database files and as well as general purpose files.
ACFS supports space efficient read-write snapshots, asynchronous file system replication, tagging for aggregate operations, fine grain security and encryption for higher security.