File Locks and SMB shares with ML
I've been doing a lot of research on SMB and the way it locks files during access. I've made a lot of ground work in my research but could use a little further assistance from this support community.
The symptom is simple to explain: Users are occasionally being prompt for a username and password when attempting to rename or move files and folders.
After doing some research on this topic, I have discovered that there is a direct relationship to files being open on the server at the time the user is attempting to rename or move the folder. The following thread, albiet old, appears to have nailed the problem on the head http://arstechnica.com/civis/viewtopic.php?p=24558131. In particular, there appears to be file locking happening when preview is turned on through the finder. I've had all users remove preview from their Macs and this appears to have helped reduce the occurances of the password prompt, but has not completly solved the problem. This is also a work around, not a fix.
I've been using a series of command to help me trace the problem including openfile.exe on the Windows 2012 Storage Server (sharing the files via smb only) to discover who has what files open on the server, and the lsof command on the client workstations to discover what process has the file open. So far, the finder is consistently the only thing with the file open... even with the finder preview turned off. I've also found that the "open file" is simply the fact that the offending users Mac has a finder window with just the folder open (none of the files within the folder or previews open).
Is the real solution to simply close all finder windows when you're done working in a folder, or is there more that anyone can think of to help me find out exactly what is holding the file lock? Is this a known bug in the SMB implementation of ML? Can we expect to see a fix with Mavericks which will now be using SMB2.0?
Any help or information anyone can provide would be greatly appreciated. I have a bunch of documentation on this issue and would be happy to share. Please let me know if anyone needs any additional details.
Mac Pro, OS X Mountain Lion (10.8.2)