Question

DFS replication between two Win2003 servers

Asked by: michaelnatale2008

We have a US office and a UK office.

The main AD domain is in the US and there is only a single DC in the UK office.

The IT guy before me setup a DFS (full mesh) between the AD domain in the US and the DC in the UK.  There are two file shares off a server in the US network that get replicated (correct term?) to the UK server.

It looks like the replication schedule is set to 24x7.  After a bandwidth analysis, it seems our Uk site is sucking up tons of bandwidth, and it is probably the 350gb of data we have under DFS.

Two questions:

1. With the sched set to 24x7, how often do changes on either side get sync'd?

2. If I adjust it so that replication is only "active" between 6pm and 6am US EST time, how can I "force" replication if I need to make sure something gets across the pond (or vice versa) in the middle of the US workday?

THANKS!

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Asked On
2009-07-30 at 06:03:16ID24612771
Tags

Replication

,

DFS

,

Windows 2003 Server

Topics

Operating Systems Miscellaneous

,

Windows 2003 Server

,

Active Directory

Participating Experts
2
Points
500
Comments
10

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Answers

 

by: chukuPosted on 2009-07-30 at 06:09:37ID: 24979330

full mesh 24/7 will update every change (saved file) to all members (I assume in your case there are only 2 members - the UK DC and 1 server in the US). you can limit the bandwidth usage or change the schedule. read this to get a better idea on DFS setup http://www.windowsnetworking.com/articles_tutorials/Configuring-Using-DFS-Replication.html
check this for replication frequency http://technet.microsoft.com/en-us/library/cc773238%28WS.10%29.aspx#BKMK_003 and read the FAQ for more info and answers http://technet.microsoft.com/en-us/library/cc773238%28WS.10%29.aspx

 

by: xxdcmastPosted on 2009-07-30 at 06:41:25ID: 24979669

Chuku gives some good advice above.

Basically you can throttle the bandwith from the DFS management console for the times you allow. The only problem there is that with the 4 hour? time difference between here you kind of have alot of the day wasted if your throttling to minimize bandwidth while people are in the offices.

I do not believe you can force a replication when you want to DFS just does its thing and in my experience will repplicate the files when it finishes its computation.

One thing that may be helpful for you is increasing the staging file size on both of the servers. Basically the staging file is where DFS does its checks for changes. The larger this is the faster DFS will be able to pull files in check them and then replicate the changes.

One last thing are both of these servers DFS-R (2k3 R2 edition) if not you will want to get them onto this and install all of the latest patches and upgrades. The DFS-R version uses Remote Differential Compression and will minimize the amount of data that needs to be replicated across the wire.

 

by: michaelnatale2008Posted on 2009-07-30 at 06:47:54ID: 24979744

Guys - thanks for the responses.

@xxdcmast: I am not sure they are R2 edition. How do I tell (I didnt build the environment)?  Will it say R2 if I right click MY COMPUTER and choose properties?  Also in this scenario there is the DC in the US, the DC in the Uk and the file server in the US where the shares are (in the UK the DC is also the file server).  I assume I should check the versions of all 3 machines?  If they are not R2 is there a way to upgrade without reinstalling?

@chuku: In the articles you reference there are screenshots of a "DFS Management" snap in for MMC - where can I find this?  I wonder if thats a screenshot from an R2 version of Win2003...?

Once I digest and exhaust my questions I will come back and split the points between the two of you, it looks like you both have given me lots to chew on - thanks a bunch.

 

by: michaelnatale2008Posted on 2009-07-30 at 06:50:56ID: 24979782

@xxdcmast: you said:
"One thing that may be helpful for you is increasing the staging file size on both of the servers. Basically the staging file is where DFS does its checks for changes. The larger this is the faster DFS will be able to pull files in check them and then replicate the changes. "

How is this adjusted?

 

by: chukuPosted on 2009-07-30 at 06:52:10ID: 24979797

if you open mmc console and click add you'll see the DFS option.

 

by: michaelnatale2008Posted on 2009-07-30 at 06:55:21ID: 24979830

@chuku:
It must be the non R2 version - my DFS MMC tool is called "Distributed File System" and has virtually NO options.  Looks nothing like the screenshot.  Sounds like R2 is the way to go...none of the systems involved are R2, btw.  I found a different Win2003 server that has the R2 version of the OS installed and it says it right under the GENERAL tab when you choose Properties from right-clicking MY COMPUTER.

I also didn't see any way to adjust bandwidth but maybe that's just another limitation of this version of DFS

 

by: chukuPosted on 2009-07-30 at 06:56:36ID: 24979844

DFS=Distributed File System

 

by: michaelnatale2008Posted on 2009-07-30 at 06:58:31ID: 24979859

I get that - the tool looks different though, completely different options and such.

 

by: xxdcmastPosted on 2009-07-30 at 07:06:56ID: 24979938

Ok so I am going to venture a guess and say that is why you are seeing such large bandwith usage. The DFS non R2 version does not use RDC.

"DFS Replication, the successor to the File Replication service (FRS) introduced in Windows 2000 Server operating systems, is a new, state-based, multimaster replication engine that supports replication scheduling and bandwidth throttling. DFS Replication uses a new compression algorithm known as remote differential compression (RDC). RDC is a "diff-over-the wire" client-server protocol that can be used to efficiently update files over a limited-bandwidth network. RDC detects insertions, removals, and re-arrangements of data in files, enabling DFS Replication to replicate only the changed file blocks when files are updated"

 

by: michaelnatale2008Posted on 2009-07-30 at 07:33:20ID: 24980220

So the DC where DFS is configured is not R2.  Neither is the target DC in the UK.
Do you think if I added an additional DC in the US (win2k3 R2) and sent the Uk guys a Win2k3 R2 file server, that would work?  I could rework the replication using the DFS that lived on those updated machines, right?

20120131-EE-VQP-002

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