On Fri, Aug 31, 2012 at 08:45:28PM +0000, Scott-Fleming, Ian wrote:
> Is it a problem to share a folder via Samba that is actually an NFS import 
> from another machine?
> 
> Looking at Samba documentation, it seems it shouldn't be.  But I find only 
> this one reference to re-exporting an NFS import via Samba  (this is under 
> "Samba 3.6 Features added/changed"):
> 
> http://wiki.samba.org/index.php/Samba_3.6_Features_added/changed#NFS_quota_backend_on_Linux
> 
> which says "A new nfs quota backend for Linux has been added that is based on 
> the existing Solaris/FreeBSD implementation. This allows samba to communicate 
> correct diskfree information for nfs imports that are re-exported as samba 
> shares."
> 
> But googling the problem, I find numerous discussions, where most contain 
> something along the lines of this:
> 
> http://serverfault.com/questions/68330/samba-sharing-an-nfs-mount-point
> 
> 
> which says, "The Samba manual mentions that re-exporting a NFS mountpoint 
> over Samba does not work correctly. NFS is not 100% POSIX compatible, so some 
> things work differently than what Samba expects.  I.e. you should run Samba 
> on the same server where you run the NFS service, exporting the local disks 
> directly."
> 
> I also came across various folks claiming one needs to play with the timing 
> parameters in smb.conf.
> 
> We're currently running Samba 3.5.10, under RHEL 6.2 (3.5.10 is the version 
> currently supplied with RHEL 6.2).  Machine Q nfs-mounts machine M's data 
> disks, and re-exports them via Samba for users to access.  We are 
> experiencing problems with the NFS share occasionally becoming very slow 
> (both for machine Q and the machines that mount them via Samba), and I'm 
> wondering if the re-export is the problem.
> 
> Question 1:  When was samba re-export of NFS import considered stable?  I.e., 
> Do I need to update to 3.6 (move ahead of RHEL distribution) for this to be 
> OK?
> Question 2:  Can someone point me to more official Samba documentation on 
> exporting?

Bottom line - it'll mostly work.

Caveat. Don't come complaining here when the locking doesn't work :-).

Jeremy.
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