Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

This isn't really a question about programming, but it is a question about working as a programmer. I hope this is an appropriate forum for this question.

I work from home. My Windows XP based laptop connects through a VPN to the network of my employer. Occasionally, I need to download a large file (~2.5 GB) that is shared on a network drive. While it's possible to just drag-and-drop the file using Windows explorer, to copy the file, there is a good chance that the VPN will timeout or my internet connection will flake out at some point during the transfer.

So what I'm looking for is a way to copy a large file that supports resuming if the connection fails. I initially tried to use rsync from within cygwin, but I don't think I had the right set of options.

I was doing "rsync -aP src_file_path dest_file_path". It would download correctly if the transfer completed without error, but if it crashed, when I issued the command again, it would start downloading the entire file.

share|improve this question
add comment

migrated from stackoverflow.com Sep 28 '09 at 23:33

This question came from our site for professional and enthusiast programmers.

5 Answers

up vote 6 down vote accepted

You might also try robocopy, an xcopy replacement that ships in Vista, and is available in the Windows XP Resource Kit.

http://en.wikipedia.org/wiki/Robocopy

Robocopy contains options (/Z) for copying files in "restartable" (read: resumable) mode.

share|improve this answer
1  
+1 nice............................................. –  Byron Whitlock Sep 28 '09 at 23:10
    
I've been a robocopy user for years and I didn't know about the /Z option. I've just spent about 10 days failing to copy a 2GB file over an unreliable ADSL line. I added the /Z to my robocopy call and it worked a treat. Yippee. –  sal Dec 14 '12 at 13:25
add comment

Your rsync command line looks correct (-P is needed to keep partially transfered files), you however have to make sure that you are actually using rsync for the data transfer itself by specifing a remote path:

rsync -aP juser@server:/tmp/data some_directory

If both paths refer to the local filesystem (even when one of them is a network filesystem), rsync can't use its delta transfer and will transfer the full file.

share|improve this answer
add comment

I like teracopy. Works like a charm and can integrate with windows explorer as well. Great for large files 10x better than windows. It is free but has a paid version.

share|improve this answer
    
Oh, that's better. Forgot about that one. It does resume. –  lod3n Sep 28 '09 at 23:07
    
I have tried using Teracopy a number of times over the past year. I think that it might be an adequate tool for copying a large number of small files, but I haven't been able to get the resume support to work properly, so it has been useless to me. Robocopy looks promising. –  user12701 Aug 24 '10 at 23:48
add comment

Being lateral, you could try setting something up with Live mesh, if you have the appropriate permissions and security.

share|improve this answer
    
Not a bad idea, but doesn't Mesh have a single file size limit? –  Chris_K Sep 29 '09 at 0:07
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.