Windows 2008 R2 DFS - How to specify root servers?

i understand dfs works in clients use dhcp subnet's determine server access first when using low-cost methods.  however, since functionality requires use of ms dhcp (which don't use), have clients randomly accessing servers either in building or on our vpn can slow.

so, question is, how can tell clients on subnet target server , use others servers if 1 becomes available?

everything seems working great now!  i'm not impressed dfs whole due lack of gui (or command-line) can see is, or isn't happening, in real-time on each server or whole.  perhaps create better product compete there isn't , working.

for looking forum in future resolution, here results:

basically, had created 3 servers throughout our worldwide vpn act dfs servers.  while "working" problem clients seemed slow @ random times.  because active directory site seen default site.  created sites in sites & services ad tools each actual site, moved dc(s) site relevant site created , created dhcp subnet representations sites.

once had done , let replicate via ad , waited clients timeout , select new server (now via proper site) working better.  ganesh , isaac in getting working me!

Windows Server  >  File Services and Storage