VTL data management issues
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Still, the same principles they introduced to manage disk and tape in mainframe environments are applicable for open-systems VTLs without mainframe costs and restrictions. Some open-systems VTLs include data management software, which manages the copying of data from disk to tape and back again. Two types of software are available to handle this: proprietary management software and third-party backup software.
Click here for an overview of Key VTL features and considerations (PDF).
Moving from virtual to physical tape
A few products, including IBM's Virtualization Engine TS7520 and Quantum Corp.'s Pathlight VX 650 and DXi7500, use proprietary management software, although they manage tape differently. For instance, Quantum's Pathlight VX 650 functions strictly as a VTL and creates virtual tape cartridges within it. Data backed up to Pathlight VX 650's virtual cartridges is stored in native tape format and each virtual cartridge is assigned its own virtual bar code. By storing data this way, the Pathlight VX 650 can directly export virtual tape cartridges to physical tape cartridges in their native tape format, which lets backup software recover data directly from tape without any dependencies on the VX 650.
This was first published in December 2007