Cameron Dale writes: > I'm backing up several different machines on my local network to my > debian-based server using BackupPC. I'm using rsyncd for all of this, > 2.6.8 on the Linux machines, and cygwin-rsyncd-2.6.2_0.zip on the > Windows machines. One of the machines is even dual booted, and the > same data is backed up sometimes by Windows, sometimes by Linux. > > I'm seeing differences in the speed and number of files transferred > for incremental backups on Linux compared to Windows. Looking at the > XferLog files, it seems that the Windows machines are only > transferring the changed files (the log contains "create d" for all > the directories, and "create" for a few new files), whereas the Linux > machines transfer all the files (the log contains similar "create d" > and "create" entries, as well as "same" entries for ALL the unchanged > files). > > This is most apparent on the dual-boot machine as some incrementals > are small and fast, whereas others are large and slow. Here is the > backup listing for that machine. Note that backups 1, 3, 7, and 10 > were all when it was booted Linux, the others were all Windows. > > Totals Existing Files New Files > Backup# Type #Files Size/MB MB/sec #Files Size/MB #Files Size/MB > 0 full 4905 2239.8 3.21 225 8.2 5072 2231.7 > 1 incr 4905 2239.8 10.37 4906 2239.8 391 0.1 > 2 incr 7 5.7 0.08 18 1.8 42 3.9 > 3 incr 4905 2239.5 3.94 4904 2239.2 3 0.4 > 4 incr 8 5.8 0.08 2 2.0 10 3.8 > 5 incr 8 5.9 0.08 2 2.0 8 3.8 > 6 incr 8 5.9 0.09 2 2.0 10 3.9 > 7 incr 4905 2239.7 12.65 4900 2235.9 9 3.8 > 8 incr 8 5.9 0.09 7 5.6 2 0.4 > 9 incr 34 24.6 0.35 26 20.2 14 4.4 > 10 incr 4730 2140.5 18.61 4725 2136.6 11 3.9 > 11 incr 34 24.7 0.37 28 20.6 11 4.0 > > I suspect this is somehow related to checksum caching, but I have > enabled the checksum-seed option globally and I think all the rsync's > I'm using should have it available. Is there something else in the > cygwin-rsyncd-2.6.2_0.zip version of rsync that is speeding up the > Windows backups? Can I somehow get that on my Linux machines too?
Yes, the entire set of files is being transferred on an incremental with a linux boot. That means some meta data (eg: uid, gid, mtime, size) is being delivered differently to rsync on windows vs linux. It is quite possible that the uid and gid are different when you boot windows vs linux. It might be related to file time stamps. What type of file system is this? If it is FAT then you are likely a victim of the DST problem. Google "rsync FAT DST". I recommend doing some manual rsyncs and seeing what meta data you get after the transer with windows vs linux. Craig ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
