On 10/22/2013 02:02 PM, Федорищев Игорь Николаевич wrote:
> Hello.
> Bacula 5.0.0, CentOS 6.4 x86_64, MySQL 5.5.34. Bacula was installed from
> CentOS Remi repository.
> Bacula server: bacula-dir, bacula-sd. Bacula client: bacula-fd. Both
> machines are in local network and have 1Gbit network cards. Maximum io
> capacity on bacula server is about 180 Mbytes/per sec (tested). Backups are
> stored on disk, no tape drive used.
>
> Bacula client is a machine with 1.2Tb data (over 1M files). When I enable
> compression on the client (compression=GZIP),
> backup performance is extremely degraded, network interface load is down to
> 100 Mbit/s.
First of all, network load is a poor metric in this case - it almost certain
that there will be less data going through the network, because it is
compressed. Also - it takes more time to compress the data than just read them
and push into network.
Mayby you should create a small fileset of 1-10GB and back it up once with and
once without compression and measure time - it will be much more reliable
indicator of performance.
Then you can try and determine the bottleneck - what is cpu load on the machine
being backed up with and w/o compression? Whats the load on disks?
To improve compressed backup performance (after you measure it reliably first)
you can:
- decrease compression level - use GZIP1, GZIP2 or any other number <6 -
default GZIP=GZIP6
- create separate filesets and run multiple jobs in parallel - this way you
will utilize more than one cpu, effectively making backup n times faster (up to
saturating your disk i/o)
Martin
------------------------------------------------------------------------------
October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60135991&iu=/4140/ostg.clktrk
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users
|
