On Mon, 11 Apr 2005 [EMAIL PROTECTED] wrote:
I had the same issue on my old debian box. It was always just writing around 33GB on the tape, never more.The data I try to backup are alot of Word-Documents and all different kind of sourcecode. So there should be at least some compression. I might try the software compression from bacula and see if that helps. But if you have some idea what else I could test I would be very glad.
If you have the space, make a .tar of your expected backup stuff and then gzip it. this will give you an indication of the kind of compression ratios you might expect.
As others have said, DAT72 is marketing-speak, they try to claim 2:1 compression on a 36Gb tape and then sell it as 72GB when real world averages are usually 1.1-1.2:1 unless you're lucky (see comments about logfiles on incrementals, etc).
I usually get 190-210Gb on LTO2s for full dataset backups (lots of already compressed files), but I also see 500-600Gb/tape on system incrementals (logfiles, lots of repetitive data)
AB
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