On Mon, Jul 20, 2009 at 10:57 AM, John Drescher<dresche...@gmail.com> wrote: > On Mon, Jul 20, 2009 at 10:37 AM, Victor Hugo dos > Santos<listas....@gmail.com> wrote: >> On Fri, Jul 17, 2009 at 6:53 PM, John Drescher<dresche...@gmail.com> wrote: >>> On Fri, Jul 17, 2009 at 5:59 PM, Simone S. >>> Santiago<sim...@magistrainfo.com.br> wrote: >>>> Hey co-workers, >>>> >>>> I wonder if it is possible improve the Bacula compression? >>>> I am using "compression = GZIP" but sometimes it compress only 15% of >>>> all volume. >>>> >>>> Note: My backup is FILE Type. >>>> >>> Try: >>> >>> compression=GZIP9 >>> >>> http://www.bacula.org/en/rel-manual/Configuring_Director.html#SECTION001470000000000000000 >>> >>> Note that this will take much longer to compress however. >> >> >> mmmm.. GZIP9 no represent exactly best compression method.. >> >> I send one or two mail to list, about this theme and I ran various >> tests with distinct values to GZIP and basically this are the results: >> >> >> ************************************************ >> Reporte de hoy (con GZIP=5 y 140GB) >> ==================================================== >> Scheduled time: 17-Mar-2009 04:30:00 >> Start time: 17-Mar-2009 04:51:20 >> End time: 17-Mar-2009 05:44:24 >> Elapsed time: 53 mins 4 secs >> FD Bytes Written: 18,119,898,810 (18.11 GB) >> SD Bytes Written: 18,119,923,547 (18.11 GB) >> Rate: 5690.9 KB/s >> Software Compression: 87.9 % >> ==================================================== >> >> >> Reporte de ayer (con GZIP=6 y 140GB) >> ==================================================== >> Scheduled time: 16-Mar-2009 04:30:00 >> Start time: 16-Mar-2009 04:35:28 >> End time: 16-Mar-2009 05:55:55 >> Elapsed time: 1 hour 20 mins 27 secs >> FD Bytes Written: 17,570,761,480 (17.57 GB) >> SD Bytes Written: 17,570,786,217 (17.57 GB) >> Rate: 3640.1 KB/s >> Software Compression: 88.2 % >> ==================================================== >> >> >> Reporte del domingo pasado (con GZIP=9 y 145GB) >> ==================================================== >> Scheduled time: 08-Mar-2009 04:30:00 >> Start time: 08-Mar-2009 04:30:27 >> End time: 08-Mar-2009 08:34:00 >> Elapsed time: 4 hours 3 mins 33 secs >> Priority: 10 >> FD Bytes Written: 18,452,613,999 (18.45 GB) >> SD Bytes Written: 18,458,242,303 (18.45 GB) >> Rate: 1262.8 KB/s >> Software Compression: 88.1 % >> ==================================================== >> ************************************************ >> >> well.. as you can see, for me, the GZIP=6 (default) is the bester >> method...because is more faster and compress better that GZIP9. >> >> bye >> > > You are not using the same exact dataset (145GB versus 140GB source > data ) in both tests so its meaningless that GZIP6 is better than > GZIP9. >
Remember every compression method is data dependent otherwise you could keep compressing data down to a few bytes... John ------------------------------------------------------------------------------ Enter the BlackBerry Developer Challenge This is your chance to win up to $100,000 in prizes! For a limited time, vendors submitting new applications to BlackBerry App World(TM) will have the opportunity to enter the BlackBerry Developer Challenge. See full prize details at: http://p.sf.net/sfu/Challenge _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
