3 ms·

well probably with compression

• jolmg 7y ago
  I wonder if the 300MBps figure might also be with compression.
  • adrian_b 7y ago
    No, the LTO-7 transfer speed is 3 Gb/s a.k.a. 300 MB/s without compression. The compression in drive may be useful for automated backups, but if you use the tape for an archive of files selected by yourself, it is better to disable the drive compression. If you have compressible files, you can compress them with better algorithms on the computer, before storing them on the tape.
    • merb 7y ago
      > you can compress them with better algorithms on the computer is that always true? what if I have dozen's of pdf's which are similar and compressed (most pdfs are)? wouldn't de-duplication also reduce the size? I mean with millions/billions/trillions of files of the same format.
      • adrian_b 7y ago
        For example on a computer you can use algorithms like lrzip, which search for very long distance redundancies (i.e. not in small data windows like traditional algorithms). This usually achieves a decent compression even on normally incompressible files, e.g. on collections of movies or on collections of PDF files, because it may find repetitions at least e.g. in the headers of the files or of the file sections. If there are similar files, then there are chances that lrzip will find repetitions between files, even if a traditional compression would not find repetitions inside a single file. If de-duplication is possible, then that would also be much more efficient than enabling the compression option of the tape drive.