Oracle Disk Manager

The Oracle Disk Manager (ODM) is a standard API specified by Oracle for database I/O. When Oracle performs a write operation, it calls the odm_io function. ODM improves both performance and manageability of the file system.

The VERITAS implementation of ODM improves performance by providing direct access for the database to the underlying storage without passing through the actual file system interface. The resulting performance is equivalent to performance when using raw devices. The administrator sees the storage as easy-to- manage file systems that support the resizing of data files while in use.

ODM Clustering Extensions

All ODM features can operate in a cluster environment. Nodes communicate with each other before performing any operation that could potentially affect another node. For example, before creating a new data file with a specific name, ODM checks with other nodes to see if the file name is already in use.