Quantum Scalar i2000, User Manual

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ADIC Management Console User’s Guide 107
Virtual device
A device presented to an operating environment by control software or by a volume manager. From an
application standpoint, a virtual device is equivalent to a physical one. In some implementations, virtual
devices may differ from physical ones at the operating system level (e.g., booting from a host based disk
array may not be possible).
Virtual library
A system that virtualizes tape drives and libraries. The system makes disk storage appear as if it were a
tape drive or tape library and magnetic tape to applications software. Also included in most virtual libraries
is a method which allows the virtual tape to become actual tape by integration with physical tape systems.
Tape libraries can be classified as open, closed, or open and closed. See also
Open library , Closed library ,
Open and Closed library .
Virtualization
The technique of managing and presenting storage devices and resources functionally, regardless of their
physical layout or location. Using virtualization, you can consolidate physical storage from multiple network
storage devices into what appears to be a single storage device.
VLI (Virtual Library Interface)
The management interface for a Pathlight VX.
VPM (Virtual Private Map)
A virtual LUN mapping scheme for SCSI-attached hosts, allowing an overall LUN total of 256 devices to be
virtually remapped.
VPS (Virtual Private SAN)
A SAN wide, virtual LUN mapping for FC attached hosts, allowing an overall LUN total of 2048 devices.
WWN (World Wide Name) or WWNN (World Wide Node Name)
A unique number assigned by a recognized naming authority. The world wide name is integral to Fibre
Channel operations.