Hinrich Aue wrote:
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).
--
Paul Bijnens, Xplanation Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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