Creating a second Exchange 2016 DAG in the same AD site for Archive Mailboxes

Liran Zamir 66 Reputation points


I have an Existing Exchange 2016 DAG with user mailboxes.
I would like to deploy on premise Archive mailboxes on different mailbox servers.
Since the backup process is configured per DAG and we do have backup issues from time to time
I was considering creating the new mailbox servers in a second DAG in the same AD site so the backups could run in parallel and not impact the other backup process.

I have a few questions hopefully someone can provide answers:

  1. Is there a problem hosting TWO Exchange 2016 DAGs in the same AD site ?
  2. Can I host the primary mailbox on a mailbox server in one DAG and the archive mailbox on a mailbox server in the second DAG ?
  3. Can two DAGs use the same DAG network address ranges ?
  4. Will the existing mailbox servers be able to proxy client access to the archive mailboxes on the second DAG without the client contacting the archive mailbox servers directly ?

Liran Zamir

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Andy David - MVP 130.9K Reputation points MVP
    1. No
    2. Yes
    3. Yes. As long as the server/cluster IPs are all unique of course :)
    4. Clients will need to be able to contact the archive servers directly. Exchange 2016 has both the CAS/Mailbox role. Is there a reason you dont want them to?

    P.S. There is typically little reason to put the archive mailboxes on separate databases or servers. I would just include them in the existing DAG if possible. Or increase the allowed primary mailbox size

2 additional answers

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  1. Morteza Soleimani 1 Reputation point

    I have an Existing Exchange 2016 DAG
    in the process of upgrading to Exchange 2019, for having a safety environment I tried to run a new DAG on new exchange server 2019 (In the same organization) but it was not successful.
    first I thought it's a misconfiguration after many troubleshooting progress and run a LAB scenario I found that is because of Exchange 2016 DAG.
    Now my question is, is it possible to add a new DAG for Exchange 2019 in the same organization that already had a Exchange 2016 DAG


  2. ömer ilgan 21 Reputation points
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