But that's hardware related too, I use a HP 9000 735/99 as backup server. A HP-Dat streamer with 2 GB is the backup device. Only 3 tapes were used...... Tape drive does 150 kb/sec maximum. Is that normal speed for that device?
I get about 380 Kbytes/sec on a DDS-2 drive (4 GByte tapes).
Question: Why doesn't amanda use all of the space on the tape? The first run it used max 1.6GB of the tape, but some dumps had space enough on it! 2 tapes could have been enough.
Amanda spreads the levels of the backups over the dumpcycle, so that each run puts about the same amount of data to tape. Therefore the backups takes each night equally long too, (and not more than needed for the constraints about dumpcycle etc). These are favorable features for a backup schedule (at least to me, it is).
If you want more on each tape, decrease your dumpcycle. (You can also decrease the dumpcycle of only a few important disks, if you like.)
Another famous backupschedule is: run full backups in the weekend, when we have time to backup till noon or later, and run incrementals during the week, to avoid long runtimes then. You'll need brute force to get amanda behave like that (but some people do).
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