dscit Posted June 24, 2008 Report Share Posted June 24, 2008 We are using Retrospect 7.5.14.102. Currently the LTO3 drive is only filling tapes to 200-300GB (should be native 400GB). I have tried cleaning the drive, updating firmware of the drive and library and reusing old tapes. Old tapes that took 400+ GB now only take 250GB. Someone help as this costing our client heaps in tape costs. Quote Link to comment Share on other sites More sharing options...
MRIS Posted June 24, 2008 Report Share Posted June 24, 2008 have you still got hardware compression enabled for the tape drive? Quote Link to comment Share on other sites More sharing options...
dscit Posted June 25, 2008 Author Report Share Posted June 25, 2008 Yes. But the tape drive is not filling the native tape space!! LTO3 uncompressed space is 400GB not 250-300. Quote Link to comment Share on other sites More sharing options...
mauricev Posted June 25, 2008 Report Share Posted June 25, 2008 I think Retrospect reports the native values. I use software compression and get about 37% compression. That would mean with your tapes, I'd be averaging almost 550 GB per tape if everything were working properly. Anyway, I would suggest an experiment if possible to package up a file as big as you can get it then back it up to tape and see how the two compare. Then you could turn off hardware compression and see what effect that has. Also, can you restore files from these tapes? It almost looks as if your LTO3 tapes are mislabeled LTO2 tapes in disguise, but as you said you tried this on tapes that already behaved as LTO3. Quote Link to comment Share on other sites More sharing options...
greggerman Posted June 4, 2009 Report Share Posted June 4, 2009 Did you ever get this issue resolved? I'm having the same issue. My LTO-3 tapes used to fill right up to the 400 GB limit, but recently (the past six months or so) my capacity has decreased to between 280 - 310 GB range. However, I'm using Retrospect Backup 6.1.138 for Mac. Quote Link to comment Share on other sites More sharing options...
Lennart_T Posted June 15, 2009 Report Share Posted June 15, 2009 That can happen when too many, too small files are backed up on a slow network. By the way, we're getting around 600GB on our LTO3 tapes. But we're using Disk-to-Disk-to-Tape, so the transfer to tape is always fast. Quote Link to comment Share on other sites More sharing options...
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