DFS 2012R2 with Dedup enabled - deletes image files?

I have a hub and spoke DFS configuration which I use to deploy Windows images from hub to branch office. Recently I've enabled Dedup on the image volumes. After updating the image file two things happened:
- Image file was deleted from disk on all target servers
- New image was not replicated

Disabling dedup was the short-term solution. Question: Is the combination DFS WDS with DEDUP supported?
LVL 3
albatros99Asked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

David Johnson, CD, MVPOwnerCommented:
don't use dedupe with DFS shares. same with System Center Shares
0
albatros99Author Commented:
Why not? Actually I found many articles that recommend using DFS with dedup because then you don't have to copy everything across the network (only the deduped bits...). Have you experienced any issues with dedup and DFS?
0
Cliff GaliherCommented:
They are compatible when architected and deployed properly. Because WDS already consolidates multiple WIM references into the res.rwm files, there is little benefit to dedup however. If you are seeing big gains, it probably means your WDS image groups are not well laid out.

Because WDS does single-instancing, it is very important that your DFS-R architecture is flawless. WDS has specific guidance on this on TechNet. It becomes even more important when throwing dedup in the mix, because dedup uses instance pointers, DFS-R specifically processes those and rehydrates the file in motion as part of the replication process. Misconfiguring WDS and DFS-R can cause that attempted rehydration to go haywire.
0
Has Powershell sent you back into the Stone Age?

If managing Active Directory using Windows Powershell® is making you feel like you stepped back in time, you are not alone.  For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why.

albatros99Author Commented:
The reason I would like to use it is because I have other file repositories on the same volume (software distribution packages). Is there a good way to exclude everything WDS from deduping?
0
David Johnson, CD, MVPOwnerCommented:
dedup stores data in system volume information in the chunk store AND every server that has this DFS share must support data deduplication .. when you configured dedup for that volume how did you configure it?  general files, virtual machine.. you could set it to not dedup certain file extensions i.e. .wim, .iso
0
Cliff GaliherCommented:
you can set up exclusions via the GUI in server manager or in powershell. The GUI is fairly self-evident.

With that said, for performance reasons, those two workloads are usually better left on separate volumes.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
albatros99Author Commented:
I found that this should be supported but probably didn't work due to a misconfiguration or DFS bug. Short-term solution might be to exclude certain files / directories.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Windows Server 2012

From novice to tech pro — start learning today.