rsync *Still* Copying All Files?

Dave Dykstra dwd at
Thu Dec 20 08:56:43 EST 2001

On Wed, Dec 19, 2001 at 04:36:21PM -0500, Mack, Daemian wrote:
> Hi, all.  This is my first post to the list, so please forgive me if this is
> an old issue.  I scoured the mailing list archives by hand and could find no
> mention of it, and the official FAQ-o-matic mentions it, but doesn't offer a
> fix that works for me.
> I've set up an rsync daemon on Windows NT4 by installing the latest cygwin.
> Using the cygwin1.dll and rsync.exe, I'm able to connect successfully from
> other NT4 and Windows 2000 machines.  I can get the rsync server to let me
> pull files over the net to my local data to synchronize.
> However, I've noticed that on the clients, *all* files are being copied
> over.  Here's the command line I'm issuing:
> C:\temp>rsync --verbose  --progress --stats --compress --recursive --times
> /cygdrive/c/temp/nmap
> I'm using a source distribution of nmap just to test with.  When I started
> noticing this error, I placed a 37MB file inside the rsyncable nmap area to
> emphasize the amount of time spent syncing.  The progress switch allows me
> to watch a realtime progress counter as the files are processed.  It takes
> several minutes for that 37MB file to come over, and the stats at the end
> hold up the theory that ~40MB of data has been transferred.  While
> troubleshooting, I added the times switch to see if preserving timestamps on
> the files would solve anything; it didn't.
> I've made sure both client and server are set to the same time.  The only
> thing I've noticed that could be a possible clue is that the files are
> different *sizes* on each disk (because of NTFS cluster size hijinks, etc.),
> so, just to be paranoid, I tried using checksum to find file diffs.  Again,
> no dice.  No matter what I try, rsyncing causes all files to be copied over
> the wire onto the local box.
> I can't figure this out.  I don't know if rsync-for-cygwin's algorithm for
> determining file differences is lacking somehow, or if something about this
> data is tricking rsync into thinking changes have occurred, or if I'm just
> doing something dumb.  
> Any ideas?

Try "--modify-window 2".  I'm not sure that will work because it sounds
like you're copying between two filesystem types that are the same, but the
option was added to copy between PC filesystems that have a timestamp
granularity of 2 seconds and Unix filesystems that have a granularity of 1

- Dave Dykstra

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