Dag Activation Preference

reuvygroovy 781 Reputation points
2021-08-17T13:56:41.643+00:00

We have Exchange 2016 and have for a while been relying on the DAG Activation Preference functionality mentioned here

Recently we noticed that the balancing mechanism isn't working, and we have some servers with many DBs, and others with none, where in a working world all servers would have at least one DB.

We tried to manually move one of the "misplaced" DBs to the host with the correct Activation Preference and it worked OK. Before we run the RedistributeActiveDatabases.ps1 script to manually balance the DBs, I wondered if there is a log (text file, event log, etc.) where we can view if the balancing is (or isn't) occurring, and why.

I checked all the commands and everything looks good:
123948-2.png124001-1.png

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.
7,667 questions
0 comments No comments
{count} votes

Accepted answer
  1. Xzsssss 8,881 Reputation points Microsoft Vendor
    2021-08-18T05:31:12.387+00:00

    Hi @reuvygroovy ,

    Have you ever mount the origin copy such as ex1\db1 back after a failover? Please note that the database copy will not be automatically mounted after the server restarted. Which means if you didn't manually mount ex1\db1, the database db1 will be mounted permanently on another server like ex2, this procress will based on the Best Copy and Server Selection. When more servers down, more databases will be mounted on other servers, obviously it will happen that multiple database copies mounted on one server.

    For your question, you could use a script named CollectOverMetrics.ps1 to collect information about the database acvitivies. This uses the Event Viewer to search for the logs related to database mount and failover ect.

    Best regards,
    Lou


    If the response is helpful, please click "Accept Answer" and upvote it.
    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

    0 comments No comments

3 additional answers

Sort by: Most helpful
  1. reuvygroovy 781 Reputation points
    2021-09-02T12:06:52.99+00:00

    Seems like the problem went away.

    1 person found this answer helpful.
    0 comments No comments

  2. reuvygroovy 781 Reputation points
    2021-08-18T06:17:52.96+00:00

    Hi

    The DB is mounted on the Primary/Secondary server. The MailboxDatabaseCopy is healthy. As I wrote, I can even manually move the BD. For Some reason, the DB is moving automatically.


  3. reuvygroovy 781 Reputation points
    2021-08-18T12:55:15.343+00:00

    yes'r and in the past it did, and to my little to nothing understanding, it should


Your answer

Answers can be marked as Accepted Answers by the question author, which helps users to know the answer solved the author's problem.