How to shutdown one exchange 2016 mailbox server in DAG

This is Parya 401 Reputation points
2021-09-08T16:20:27.84+00:00

Hello everybody,
I have an exchange 2016 and a DAG, I have two exchange servers and 12 databases.
I want to shutdown one of the mailbox servers in the DAG which is exchange1
What I did for this:
First active the copy on exchange2.
delete the DNS records point to Exchange1 and I ran this comment: Get-MailboxDatabaseCopyStatus -Server exchange2 and the result was "mounted" and I test mapi connection and it was successful. and I ran Get-MailboxDatabaseCopyStatus -Server exchange1 and it was healthy.
But after shutdown the service didn't work and also the status of databasecopy was unknown.
Did I miss something?
what should I did step to step?

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. Kael Yao-MSFT 37,586 Reputation points Microsoft Vendor
    2021-09-09T09:26:07.127+00:00

    To me the problem seems to be the DAG lost quorum, which caused the databases on exchange2 to be dismounted.
    It would happen if the witness server wasn't online or accessible in a two-node DAG.

    If you run this command in Powershell, would it show the witness server is online?

    Get-ClusterResource  
    

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    1 person found this answer helpful.

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