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Re: [Bacula-users] Fwd: Re: Bandwidth in Bacula (slow rate)
2017-03-22 13:32:53
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FWIW: There is virtually no benefit in network compression for
link speeds of 1Gb/s or faster.
It's a net benefit on WAN links or on 100Mb/s networks, but I
found it had a tendency to slow things down (and use a lot of
CPU!) on 1Gb/s networks vs letting the networking traffic run
uncompressed. On 10Gb/s interconnects it is definitely slower than
letting things run uncompressed.
Experimentation has shown that most modern CPUs seem to max out
about 120-150MB/s throughput on singlethreaded simple compression,
or about 35-40MB/s if gzip is used.
As in many things there are tradeoffs of CPU vs speed and if your
network is "fast enough" then all compressing data in transit is
really achieving is making your system run hotter with no real
benefit.
As far as I'm aware bacula is not using using multithreaded
compression libraries.
Kern, can you correct me if I'm wrong?
Alan
On 22/03/17 15:15, Norbert Gomes wrote:
-------- Message transféré --------
Hi
I've been confronted at the same situation, and that was due
to the compression that was enabled on the FileSet. You can
try to disable it and see the network transfer performance.
The workaround was to disable compression for some file
extensions
Regards
Norbert
Le 21/03/2017 à 15:35, Josh Fisher a écrit :
On 3/21/2017 9:44 AM, Petar Kozić
wrote:
Hi,
I
will try to describe my problem with slow transfer rate.
I
was setup Bacula server and now every day I will put one
by one instances in backup.
Yesterday
I was put one instances and backup was done fine. But for
about 47,000 files, sum size 930 MB, bacula is transfer
for 11 minutes. Transfer rate is about 1,230 KB/s.
That's
very slow. I try to measure bandwidth with iperf. Both
instances are on linux. That was Gigabite network between
two nodes.
Iperf
says:
Interval
Transfer Bandwidth
0.0-10.0
sec 1.08 GBytes 928 Mbits/sec
I don’t have any Bandwidth statement in configuration file.
How can I run backup faster ?
What are the SpoolData and SpoolAttributes settings for the
job? This is likely due to database issues. Make sure that
SpoolAttributes=yes so that database updates happen in a batch
at the end of the job, rather than during the job. If writing
to tape, then make sure SpoolData=yes. If writing to disk,
then SpoolData=no.
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