rsync not updating files even with checksum flag

[dfirth]

I get this with Outlook (.pst) files when the change is small (say one
additional text email)


Mark Osborne-2 wrote:
> 
> Hello everyone,
> 
> I am having a problem with rsync that I hope someone can help me figure 
> out.  We are using rsync to sync up files between our staging and 
> production ftp servers.  Basically internal users are allowed to upload 
> files via a samba share to a staging server.  Those files are then synced 
> out every 15 minutes via cron to our production ftp servers.
> 
> The problem occurs when a large file is being upload from a windows 
> machine via the samba share.  If a rsync is instantiated during the time 
> that the file is being uploaded the destination machines get the file with 
> the correct filesize and timestamp.  Unfortunately, even though the file 
> shows the correct size it is not a good copy of the file.  An md5sum of 
> the files on both the source and destination machine returns different 
> results.  I believe this occurs because windows automatically "reserves" 
> the full size of the file and fills it out with 0s and then overwrites 
> this as it goes along copying.  This wouldn't be a big deal except, 
> subsequent runs of rsync (even with -c) fail to overwrite the file. 
> 
> I have tested running an rsync while I was copying the file over to the 
> source directory locally (not via samba) and the file was corrupted. 
> However after running an rsync again, the file was updated.  Basically the 
> problem only occurs when uploading the file via the samba share. 
> 
> I know I could use the -I flag to ignore times and filesizes, but from my 
> understanding this would result in resyncing every file every time, and 
> this is not what we want.  We are currently using rsync 2.5.5 on the 
> source machine, and 2.5.7 on the 2 destination machines, but I have also 
> tested using 2.6.8 on both source and destination with the same results.
> 
> Has anyone else experienced this problem before, or have any ideas for a 
> fix?  Let me know if I'm not being clear enough, or any other information 
> I can provide.
> 
> ~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~
> Mark Osborne
> Web Systems Engineer
> mark.osborne at ni.com
> (512) 683-5019
> ~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~^~
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