A CDE Definition
virtual tape system
A peripheral unit that combines a disk cache and tape library to improve performance and eliminate cartridge waste. Also called a "virtual tape server," data intended for tape are written to the disk cache and later written to tape in the background. If a tape is read frequently, a certain amount of its data is held in the cache, which greatly improves access times over the slow loading process of a robotic library.
Tape files, no matter how small, are typically stored on one cartridge. A virtual tape system (VTS) provides volume stacking, which stores multiple files on a single volume. The virtual tape system indexes the files and manages them, dramatically improving cartridge efficiency. See virtual tape library.
virtual tape library
A hard disk array that emulates a tape library. A virtual tape library (VTL) enables the storage medium to be switched from tapes to disks while continuing to use the existing tape backup software. See virtual tape system and storage virtualization.
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