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Exchange Server DAG, DB GUID info missing from registry on one of my three servers

Larry Desmond 0 Reputation points
2023-05-03T02:08:09.52+00:00

I have inherited a three server Exchange 2016 DAG running on 2012 R2.

We have two DBs(old) on one drive and we created two new DB's on different drives to move to.
So one of the changes was to increase the DB size threshold in reg.

I went in to the registry on my Primary srv1 to make the reg change to increase the DBs size threshold.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ServerName\Private-GUID\
Restarted services and it was populated to one of my secondary's srv2 but not the other srv3.

I open the key up I on srv3 and I only see two entries, the two missing are the new DB's created about 3 months ago.

If we never actually failed over to srv3 would it not have the reg keys for the DBs?

Do we need to make it Primary to get the GUID entries?

I have never seen an issue like this and before I start testing things I wanted to get some opinions.

Thanks

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  1. Aholic Liang-MSFT 13,826 Reputation points Microsoft Vendor
    2023-05-03T08:38:13.4333333+00:00

    Hi @ Larry Desmond ,

    Typically, when you change this registry, the change is propagated to all servers that host copies of this database.

    I recommend that you could recreate these two new database copies in Srv3 to see if the issue persists.

    If it is still not synchronized, it is recommended that you run Test-ReplicationHealth and check the event log for any messages indicating a problem that might prevent the GUID update for the new database.

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