On 2008-04-30 13:45, Edi Šuc wrote:
Hi.
It seems that I can't disable software compression in amanda. I tried
everything that could in my opinion have an impact on compression. But
no luck. The problem is that i have a relatively slow machine and it
takes forever to complete the backup. If I check the processes i see this:
19021 ? S 0:00 \_ /bin/sh /usr/sbin/amdump AAA1
19031 ? S 0:00 \_ /usr/lib/amanda/driver AAA1
19032 ? S 0:01 \_ taper AAA1
19037 ? S 0:01 | \_ taper AAA1
19033 ? S 0:08 \_ dumper0 AAA1
19034 ? S 5:31 \_ dumper1 AAA1
19074 ? S 0:08 | \_ /bin/gzip --best
19035 ? S 0:00 \_ dumper2 AAA1
19036 ? S 0:00 \_ dumper3 AAA1
19066 ? S 8:59 \_ chunker1 AAA1
I suppose that there shouldn't be a "gzip --best" if I disable the
compression. I also tried to use the directive "compress fast" in the
"define dumptype" section, but no luck. "gzip --best" is still there (it
should at least change to "gzip --fast").
The index (list of filenames in the backup) is ALWAYS compressed using
"gzip --best", and I bet that disabling the index (or not compressing it)
will not speed up the process.
The bottleneck you have is probably something else.
client-disks? network?
I can only say that usually the power for the amanda server is not
that important (except for those modern tapedrives, that expect
to be provided with a continued 80 Mbyte/sec or more, which
simple IDE drives cannot provide).
I had for a long time an Amanda server having 128 Mbyte RAM, 300 Mhz
Celeron, 80 Gbyte IDE holdingdisk and AIT-1 tapes (35 Gbyte native).
It was serving 120+ DLE's from about 30 hosts. In that time the
bottleneck was on the clients (disk-IO + software compression).
And for my home config I have a similar old computer 500 MHz, 192Mbyte RAM
but with twice software raid-1 250GB disks for vtapes + one 60 Gbyte
for root filesystem, software and holdingdisk. And still the bottleneck
is the client and the network (wireless is not that fast; and powerline
is not fast either).
To locate bottlenecks, use the commands amstatus and amplot (especially
the last one, is very enlighting!).
In your config I see:
netusage 600 Kbps
I would eliminate it, as well as the limits on each interface you specified.
--
Paul Bijnens, xplanation Technology Services 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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