Question about Quantum ValueLoader SDLT 320 Super DLT Tape Drive
NTBackup will NOT see individual tapes, but treat the SDLT320 drive as a stand alone with one big tape, and the Valueloader will automatically change tape, in sequence, until the backup is done.
This is the major difference between a "Autoloader" (Sequential Mode) and a "Library" (Random Mode).
In Sequential Mode the robot (or Medium Changer) is hidden from the OS, thus only providing a tape drive. The autoloader is smart enough to see incoming data and will move Tape1 into the drive. As the media fills, the autoloader will swap media on it's own. By the time the backup is complete, whether it be one or all 8 pieces of media, Windows has no clue that it's data crossed multiple pieces of media.
In Random mode, the library is dumb and will do nothing on its own. It's told by software (i.e. Backup Exec, CommVault, etc.) when to move a tape into the drive and which tape to move!
The advantage of using Random Mode is that software runs the show and media is effeciently managed. Restores are much quicker as the exact tape a file is recorded on can be directly loaded and extracted, vs. (worst case in Seq. mode) having to go through each tape, in sequence, before getting to the file that could be on that last tape (think hours!).
Posted on Jan 06, 2010
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Posted on Jan 02, 2017
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