On Thu, Mar 3, 2011 at 4:11 PM, Fabio Napoleoni - ZENIT <fa...@zenit.org> wrote: > > Il giorno 03/mar/2011, alle ore 20.53, Alan Brown ha scritto: > >> Fabio Napoleoni - ZENIT wrote: >> >>> Thank you for your analysis, after that I think that the problem is not the >>> nfs overhead, because the despooling phase (over nfs filsystem) has a >>> transfer rate of 7.3 MBps, so it's fine. Instead the first phase (bacula-fd >>> -> bacula-sd) happens at 1.2 MBps which is very poor value I think. >> >> Is this a full backup? > > Yes it is. > >> You can't get accurate results with anything else. >> >> compression=GZIP # compress backup >> >> This will have a MARKED effect on your speeds. Consider switching it off and >> see how fast things go. > > I tried to disable both compression and signature with this results: > > Job write elapsed time = 00:03:31, Transfer rate = 7.918 M Bytes/second > Despooling elapsed time = 00:03:50, Transfer rate = 7.272 M Bytes/second > > This is the performances with signature only (no compression) > > Job write elapsed time = 00:03:42, Transfer rate = 7.528 M Bytes/second > > And this is the performances with compression only (no signature) > > Job write elapsed time = 00:12:51, Transfer rate = 1.322 M Bytes/second > > So the poor throughput is given by software compression. I don't know what to > choose in the speed vs space tradeoff. Ideally the best option could be > compression on the storage director (it has more powerful hardware than this > client) but I think that bacula currently doesn't support this feature. >
You could do that with filesystem compression. There are a few options for that. Although I admit none of them are in the mainline kernel. John ------------------------------------------------------------------------------ What You Don't Know About Data Connectivity CAN Hurt You This paper provides an overview of data connectivity, details its effect on application quality, and explores various alternative solutions. http://p.sf.net/sfu/progress-d2d _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
