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?
Thanks for the help,
Cam
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