Many thanks Phil, as the nolock option really did the trick. I also managed to 
solve the performance issue by using the kernel nfs daemon provided by dns-320 
kernel. I'm not sure if there is a nfs-kernel daemon for dns-323 devices 
kernel. Then I manually *cat* ffp/etc/exports file content to /etc/exports, 
because /etc/exports content vanishes at every reboot. I was thinking about 
using a script at ffp/start to do the magic when I read your post. Obviously 
using a user space nfs daemon with nolock client-side option is far more 
reliable than my approach. Thank you.

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