In an N8500 Clustered NAS System, the Veritas Volume Manager

In an N8500 clustered NAS system, the Veritas Volume Manager (VxVM) is located between the operating system and the data management system. The VxVM accesses disks using the interface provided by the operating system, makes the physical storage devices connected to hosts invisible, and provides a logical device layer for the data management system. The logical devices on this layer are called VxVM volumes.