[Samba] XP SP3 and posix locking

Volker Lendecke Volker.Lendecke at SerNet.DE
Fri Jun 6 12:33:13 GMT 2008

On Fri, Jun 06, 2008 at 01:42:50PM +0200, Dirk Kastens wrote:
> the home directories of our users are NFS-mounted from a NetApp filer to 
> our samba server. Everthing was fine until the users installed the 
> service pack 3 for Windows XP on the client machines. Suddenly it was 
> impossible to write MS Office files on the samba share. Word or Excel 
> documents could only be opened in read-only mode. After de-installing 
> SP3 everything worked well again.
> I found out that setting the samba option "posix locking = No" resolves 
> the problem. The manual page of smb.conf says: "You should never need to 
> disable this parameter." So I think this is only a temporary solution. 
> Microsoft must have changed something regarding the locking mechanism 
> inside the service pack.
> Any ideas?

Well, re-export of NFS-imported directories is not
recommended and one of the exceptions to "you should
never..." :-)

If you have NetApp installed, why re-export via Samba?
License issues?

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