Re: rsync *Still* Copying All Files?
On 20 Dec 2001, Mack, Daemian [EMAIL PROTECTED] wrote: The question is, why does it work? Are you indeed copying between two NTFS filesystems, with rsync running under Windows cygwin on both sides? I would have thought that would result in matching timestamps granularity on both sides so rsync would always end up comparing the same values. Now that you've jogged my memory, I remember coming across a Knowledge Base article around a year ago that discussed this filesystem timestamp granularity. I can't recall the reason for it, or the set of circumstances under which it's an issue, but maybe this article touches on the issue long enough to be of relevance: http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q127830 My hunch is that this is happening because I'm dealing with NTFS5 on Win2K and NTFS4 on NT4. I think there are some NT APIs that only return time in 2sec resolution. Possibly Cygwin is using them? (Why would it, though?) -- Martin The daffodils are coming. Are you? linux.conf.au, February 2002, Brisbane, Australia --- http://www.linux.org.au/conf
Re: rsync *Still* Copying All Files?
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:\temprsync --verbose --progress --stats --compress --recursive --times 10.8.1.57::nmap /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 second. - Dave Dykstra
RE: rsync *Still* Copying All Files?
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 second. W! That did it! Wouldn't you know it'd be the one switch I didn't think to try? Thanks! Daemian Mack
Re: rsync *Still* Copying All Files?
On Wed, Dec 19, 2001 at 05:03:51PM -0500, Mack, Daemian wrote: 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 second. W! That did it! Wouldn't you know it'd be the one switch I didn't think to try? The question is, why does it work? Are you indeed copying between two NTFS filesystems, with rsync running under Windows cygwin on both sides? I would have thought that would result in matching timestamps granularity on both sides so rsync would always end up comparing the same values. - Dave Dykstra
