Amanda-Users

Re: Compression again

2007-04-13 10:21:56
Subject: Re: Compression again
From: Sebastian Henrich <shss AT gmx DOT de>
To: Jean-Louis Martineau <martineau AT zmanda DOT com>
Date: Fri, 13 Apr 2007 16:13:11 +0200
My OS is openSUSE 10.1.

server:~ # tar --version
tar (GNU tar) 1.15.1

server:~ # dump
dump 0.4b41 (using libext2fs 1.38 of 30-Jun-2005)

The last dendbackup.*.debug is attached.

Thanks

   Sebastian

At 13:50 13.04.2007, Jean-Louis Martineau wrote:
The orig-kb is the size reported by the backup tool (tar, dump, ...)

It's possible that amanda doesn't parse the output correctly.

What's your OS? backup tool?

Could you post a sendbackup.*.debug file?

It's probably already fixed in a newer version.

Jean-Louis

Sebastian Henrich wrote:
Here is the result after deleting full-comp und incr-comp.

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 2229585  2833801 127.1  10:58 4307.9  15:19 3083.2
server       /profile    0 4557175  4541611  99.7  21:07 3583.6  24:46 3055.3
server       /daten      0 1221325  1796309 147.1   4:44 6321.5   9:46 3065.4
server       /intorg     0  188995   199786 105.7   1:22 2427.2   1:07 2971.2
server       /literatur  0  662255  1051091 158.7   2:36 6737.3   5:39 3097.9
server       /projekte   0 8876700 11223553 126.4  43:33 4295.4  60:48 3076.9

Once again the data seems to grow while it's written to the tape. But I think I figured out the problem. During the calculation of the estimates everything seems to be ok and all sizes are like the real ones on the disk. The problems start with the dumper. The dumper doesn't compare his result with the real sizes but with the real sizes divided by two because of the default compression set to 0.50. A compression to 50% isn't possible on all the disks and that why the data seems to grow.

My question is now, is this a bug of version 2.4.5? At the moment I don't get packages for openSUSE 10.1 from SuSE or the amanda homepage with the newest version. Perhaps I should try this next?

Thanks again

  Sebastian

At 22:20 12.04.2007, Jean-Louis Martineau wrote:
I don't understand.

Did you set a 'comprate' in your dumptype? You should remove it.
Amanda will learn the compresion ratio after a few run.

For all 'info' file, you can remove the value in the 'full-comp' and 'incr-comp' line.

Jean-Louis

Sebastian Henrich wrote:
Here is the log.

Sebastian

Attachment: sendbackup.20070412234545.debug
Description: Binary data

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