Amanda-Users

Compression again

2007-04-12 15:44:25
Subject: Compression again
From: Sebastian Henrich <shss AT gmx DOT de>
To: amanda-users AT amanda DOT org
Date: Thu, 12 Apr 2007 21:38:36 +0200
Hello again,

I still try find the cause of my problems with amanda. When the backup finishes, I get the following dump summary:

                                     DUMPER STATS            TAPER STATS
HOSTNAME     DISK        L  ORIG-kB OUT-kB COMP% MMM:SS  KB/s   MMM:SS  KB/s
-------------------------- ------------------------------------ -------------
server       /home       0 2229570  2833775 127.1  11:01 4287.6  15:21 3077.9
server       /profiles   0 4553900  4539435  99.7  21:12 3569.5  24:46 3054.9
server       /data       0 1221335  1796306 147.1   4:43 6347.3   9:52 3032.3
server       /org        1    3520     1109  31.5   0:08  135.0   0:03  344.0
server       /lit        1      40        2   5.0   0:01    1.4   0:03    0.6
server       /projects   0 8876515 11223308 126.4  43:35 4292.3  60:48 3076.9

(brought to you by Amanda version 2.4.5)

and the following notes

planner: server /srv/samba/share/org 20070412 0 [dumps too big, 397003 KB, full dump delayed] planner: server /srv/samba/share/lit 20070412 0 [dumps too big, 1433505 KB, full dump delayed]
  taper: tape Tape05 kb 20394240 fm 6 [OK]

The original data has the following sizes:

/home      4452664 kB
/profiles  8996864 kB
/data      2437400 kB
/org        376376 kB
/lit       1316660 kB
/projects 17768808 kB

So first I don't understand why ORIG-kB is half of the size. I use software compression (compress server best). Hardware compression ist turned off ("amtapetype -c" proofs this).

Next I don't understand why the data grows during it's written to tape.

The third thing I don't understand why amanda delayes two "disk". If I summarize the sizes I get 21,19 GB to store. The tape length is 36 GB uncompressed. So it should fit on the tape.

Hope that somebody can help me


Thanks for helping me

  Sebastian





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