The idea of using --whole-file is that rsync behaves like tar and I thought that I could set --whole-file so that the rsync method would behave like the tar method and compare byte by byte rather than using checksums. I had a look both in the rsyncp and BackupPC code (RsyncFileIO.pm). The use of checksums is intrinsic in the way that the rsync transfer method works. So it uses the full file MD4 checksums to determine whether a file has changed at all. Whether it uses the whole file option for transferring changed files is unimportant since 99% of our files don't generally change between fulls. After poking around it seems that the --whole-file option is specific to the actual rsync tool and the BackupPC code along with RsyncP send a customized set of commands to the rsync server. So it appears that not all of the rsync "program" options are applicable. Maybe we already knew this but yeah this concludes my investigation of --whole-file. I have attached a patch file that doesn't add the --ignore-times argument to a full backup. It is based on backuppc 3.2.1.
-----Original Message----- From: Les Mikesell [mailto:lesmikes...@gmail.com] Sent: Sunday, 29 September 2013 1:26 AM To: General list for user discussion, questions and support Subject: Re: [BackupPC-users] RsyncP and --whole-file On Sat, Sep 28, 2013 at 7:30 AM, Till Hofmann <hofmannt...@gmail.com> wrote: > Doesn't rsync calculate checksums even if you set --whole-file? It > doesn't calculate block checksums but it still calculates file > checksums - and if they match it skips the file (which only happens if > you set --checksum-seed because otherwise it uses the current time as > checksum-seed) > Yes, --whole-file still shouldn't send matching files. If you ran over ssh you would be able to use ps to see what options were passed on the remote command line. If you are poking around in the code, maybe you could find a way to turn off the automatically added --ignore-times that is added to full runs. That would make it go as fast as incrementals, at the expense of a little safety. -- Les Mikesell lesmikes...@gmail.com ------------------------------------------------------------------------------ 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=60133471&iu=/4140/ostg.clktrk _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com If you have any question, please contact MCRI IT Helpdesk for further assistance. ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________
backuppc-ignore-times.patch
Description: backuppc-ignore-times.patch
------------------------------------------------------------------------------ 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=60133471&iu=/4140/ostg.clktrk
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