It doesn't look as if anybody has suggested solutions for your 
problem, so here's some information that probably won't help, but might:
     I have a Western Digital ShareSpace NAS which, like your devices, did 
not preserve uid/gid on files copied to it under nfs.  But the web 
interface for controlling the NAS shows an advanced option permitting root 
SSH access.  I didn't see the option in the manual, but it's there, and 
maybe it's available on one or both of your devices.  After (temporarily) 
enabling SSH and logging onto the NAS as root (then changing the 
password), it became clear that it's a computer with a tiny memory and a 
puny processor running a small linux operating system to control disk 
space with the help of software raid.  In its /etc/exports was a line

/nfs/Public *(rw,all_squash,sync,insecure,anonuid=65534,anongid=65534)

Changing the line to

/nfs/Public *(rw,sync,no_root_squash)

and doing '/etc/init.d/S80nfsd reload' resulted in preservation of uid/gid 
on files copied to it under nfs.

Steven Yellin

On Wed, 14 Apr 2010, julian_klein wrote:

> Hello,
>
> I've some problems mounting some folders, located on NAS-Devices.
> One is a old freecom fsg-3, the other one is a newer Netgear Duo.
>
> When I'm mounting the folders into a mountpoint in my user-folder using 
> fstab, i can open, delete, copy or rename files using nautilus without any 
> proplems.
> But when I open any file with an application - for example with openoffice 
> writer or another application - i can't save the file without problems. I 
> have to save it localy, and then I have to paste it with nautilus. I can't 
> create "working" files at all with an application .
> But the "save-copies" witch are made for example by openoffice in my 
> user-folder (.../.openoffice/...) will be empty files. In the cifs-folder, 
> the files are created, but are empty (0 Byte) files.
> When I open existing files I get an error, that openoffice can't create the 
> save-copy. When I try to create files with openoffice, the error message says 
> "General E/A error" (this error-message is translated).
>
> My fstab is like that:
> //[IP-Numer-NAS]/[folder]         /home/userfolder]/[folder]           cifs 
> rw,username=blabla,password=blabla     0 0
>
> On the NAS-devices, uids and gids are different from uids/gids on my 
> workstation, so using nfs is no option, I think.
> When I mount the folders, using the gnome-menu option "Verbindung zu 
> Server..." everything works fine.
> So I think, obviously there is something wrong with my fstab syntax.
>
>
> Could somebody help me with that?
>
> thx in advance,
>
> Julian
>