Virtual tape

The desire to reduce the dependency on tape for recovery gave rise to the development of virtual tape libraries (VTLs) that use disk drives for storing backup data by emulating tapes and tape hardware. Off-site storage of backup data is accomplished by copying virtual tapes onto physical tapes and transporting them to an off-site facility. This backup design is called disk-to-disk-to-tape, or D2D2T—where the first disk (D) is in file server disk storage, the second disk (D) is in a virtual tape system, and tape refers to tape drives and media.

VTLs significantly improve the automation of backup processes and provide good backup performance, but are more expensive than tape backup systems. Because the storage capacity of virtual tape products is limited, it might not be possible to backup as many servers or retain as much backup data as desired. For cost, capacity, and performance reasons, VTLs were mostly used in niche environments until dedupe technology was integrated with them and made them more widely applicable.

Source of Information : Rethinking Enterprise Storage

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