Hi Nikolai,
thanks for your reply. Actually in my case the solution was even simpler since i didn’t have to mess up with iSCSI but just an external NFS server. So, another classic case of RTFW as described here [url]http://fogproject.org/wiki/index.php?title=FOGUserGuide#Separate_NFS_Server[/url].
Don’t know why but my mind has stuck in the idea that the /images folder was some kind of a magical folder required by Fog. I just pointed the image directory to the NFS share and it worked fine.
Thanks for your help.