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Speedy Filesharing independent to the users location / DFS?

Hi Experts

We are just setting up a new Resource Topology with 1 Resource Forest spread over 2 locations (US and EU) and 2 Account Forests (US and EU). The Resource Forest locations are different to the office locations.

We would like to put all our Files, redirected folders and user account profiles in the Resource Forest and no matter where the user logs in (US or EU) he/she will always get speedy access to fileshares.

Would DFS be the solution we are looking for?
How would a user from the US Account Forest authenticate in the EU Account Forest?
Which kind of Trust do I need between those two Forests then?

My thought for DFS:
Account Forest -------------------------Resource   Forest -----------------------------------Account Forest
User Account --------------------------Share-------Share-----------------------------------------User Account
User Account ------------------------Redirected---Redirected-----------------------------------User Account

Would this work? What is common practise for this?

Thanks for your help in advance
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2 Solutions
What kind of files and what kind of connections do you have?
Authentication happens using site/subnet user belongs to while login to domain. On login to domain, SRV records are query which site user belongs to & it send authentication request to mapped site with subnet the user machine belong to from where he is try to access domain resource.


If the two forest is different you can use external forest trust with dns(stubzone,forwarder or secondary zone) & firewall port in place.

If you want user from any forest access resource in any domain of forest two way transitive trust relationship is required.

DFS is the solution for sharing the files & user doesn't have to remember the different server name.

Bandwidth Link will play important role here.
Dan-ITAuthor Commented:
Thanks Guys

It's going to be sharedfiles (spreadsheets, documents, pdfs ect. ), redirected folders and userprofiles.
Bandwidth is more than sufficient I guess. Slowest link will be a 20Mb site to site.

There will be no active user accounts in the Resource Forest. User accounts from Account Forests only access files in the Resource Forest.

Each location (US and EU) has its own Fileserver.
Do I have to put the 2 Fileservers together under one big DFS namespace so when USuser is in the EU, he would get his files from the EU Fileserver in the Resource Forest.
Same with the Redirected Folders. If I set redirected folders via Group Policy to the same namespace for US and EU users. Will that be enough that when USusers login from EU don't have to wait until their files get downloaded over the ocean?

Awinish: Is there an advantage if I put a DC from US into the EU site and vice versa?

Let me know if you have any questions... maybe I'm not explaining correctly what I'm trying to achieve.
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Authentication will be faster because a user who is in US will not have to authenticated by EU which can take time.

Have you heard of Branch Cache, its new feature of windows 2008 R2 & windows 7.


If you put two file server in US & EU it will be better from the point of redundancy & balanced load as both the file server will contain same data & there will be sync in the data from time to time.

Yes,configuring the name in the server is fine.
Dan-ITAuthor Commented:

BranchCache sounds good. Will look into this.

I'm still concerned having those many files under one DFS Namespace. Is there any reason for concern?


I don't think, regular backup & redundancy should remove your concern.

If you have 20MB, the speed shouldn't be a concern. I run a 3MB line between US-Canada-Mexio, I am still OK.

If it is, you can look into something called WAN Optimization. Many prominent companies make products like that such as CISCO, RiverBed, and Bluecoat. WAN Optimization is a piece of hardware you deploy at each site. It then does compression and caching. The improvement of speed is amazing - about 50% to 200%. It's more impressive on documents like Word, Excel etc. and HTTP traffic.

This is something I am implementing.
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