VxVM is layered on top of the operating system interface services, and is dependent on how the operating system accesses physical disks. Before a disk can be brought under VxVM control, the disk must be accessible through the operating system device interface. VxVM is tightly coupled with the operating system. VxVM operates as a subsystem between operating system and data management systems, similar to file systems and database management systems. You can use VxVM to dynamically configure disk storage while the system is active. VxVM also provides the tools to improve performance, and ensure data availability and integrity. VxVM overcomes physical restrictions imposed by hardware disk devices by providing a logical volume management layer that lets volumes span multiple disks. VxVM provides features that enhance fault tolerance and fast recovery from disk failure. By supporting the Redundant Array of Independent Disks (RAID) model, VxVM can be configured to protect against disk and hardware failure, and to increase I/O throughput. VxVM provides easy-to-use online disk storage management for computing environments and Storage Area Network (SAN) environments. A VxVM volume appears to applications and the operating system as a physical disk on which file systems, databases, and other managed data objects can be configured. VxVM is a storage management subsystem that lets you manage physical disks as logical devices called volumes. (Logical devices do not have the limitations of physical disks.) VxVM is a storage management subsystem that lets you manage physical disks as logical devices. Veritas offers the Veritas Volume Manager (VxVM), which is either packaged as a standalone add-on, or part of a larger package, such as the Veritas On-Line Storage Manager. Both companies offer products that help UNIX system administrators manage storage with very flexible methods. In the world of UNIX® storage management, there are two primary leaders: IBM and Veritas (now Symantec).
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