never I was able to split a voume with DFS.
Everytime I get a errormessage after submitting the new volume settings page "The GUID has not been set". The names are unique.
That function was not working under NW6.5SP7 and not after applying SP8 (and renewing the iManager plugins and restarting tomcat) too.

What can I do?
Should I not split the SYS volume at "usr"?
(it is a test system under VMWare)