EXCHANGE 2016 DAG - Failover Cluster Event ID 1090

SMI 1 Reputation point
2020-12-03T18:38:51.43+00:00

Hello,
We have 6 exchange 2016 Server and failover Cluster in one of the server is not starting. But mailbox database copies are fine.

The Cluster service cannot be started. An attempt to read configuration data from the Windows registry failed with error '2'. Please use the Failover Cluster Management snap-in to ensure that this machine is a member of a cluster. If you intend to add this machine to an existing cluster use the Add Node Wizard. Alternatively, if this machine has been configured as a member of a cluster, it will be necessary to restore the missing configuration data that is necessary for the Cluster Service to identify that it is a member of a cluster. Perform a System State Restore of this machine in order to restore the configuration data.

These are the command from the output. As per this Replication and seeding status Healthy. But Cluster Service Failed.
We don't have any backup data to restore.

[PS] C:\Windows\system32>Get-MailboxDatabaseCopyStatus -Server “d-email02”

Name Status CopyQueue ReplayQueue LastInspectedLogTime ContentIndex
Length Length State

DB1\D-EMAIL02 Healthy 0 0 12/3/2020 12:54:51 PM Healthy
DB2\D-EMAIL02 Healthy 0 0 12/3/2020 12:55:28 PM Healthy
DB3\D-EMAIL02 Healthy 0 0 12/3/2020 12:55:17 PM Healthy
DB4\D-EMAIL02 Healthy 0 0 12/3/2020 12:55:42 PM Healthy
DB5\D-EMAIL02 Healthy 0 0 12/3/2020 12:54:50 PM Healthy

PS C:\Users\administrator.NYCC> Get-ClusterNod

Name ID State

D-EMAIL01 3 Up
D-EMAIL02 4 Down
D-EMAIL03 6 Up
C-EMAIL01 1 Up
C-EMAIL02 2 Up
C-EMAIL03 5 Up

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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Windows Server Clustering
Windows Server Clustering
Windows Server: A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.Clustering: The grouping of multiple servers in a way that allows them to appear to be a single unit to client computers on a network. Clustering is a means of increasing network capacity, providing live backup in case one of the servers fails, and improving data security.
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  1. SHAMBHU SHARMA 11 Reputation points
    2022-12-05T08:57:33.33+00:00

    If you face same problem in Exchange 2019 server:

    1. Clear-ClusterNode -Name XXXXXX (Problematic Server) -Force (PowerShall)
    2. Restart the server
    3. Add-DatabaseAvailabilityGroupServer -Identity "DAG Name" -MailboxServer XXXXXX(Problematic Server)
    4. Server should be added and validate the DAG members and FileShare.
    1 person found this answer helpful.
  2. Eric Yin-MSFT 4,386 Reputation points
    2020-12-04T03:37:43.957+00:00

    It might be caused by a corruption over the cluster, please try the following steps:
    Manually Start Cluster Service of D-EMAIL02 in Cluster Service Manager.

    If failed, open the Command prompt as an administration and run the below command: 

    Cluster Node D-EMAIL02 /ForceCleanup

    Then reboot the server and run the below command on Exchange Powershell to re-add the node back to Cluster: 

    Start-DatabaseAvailabilityGroup DAG1 -MailboxServer D-EMAIL02

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  3. SMI 1 Reputation point
    2020-12-04T16:25:58.037+00:00

    Hi EricYin,

    Do I need to remove the server first before re-add back to DAG ?
    Remove-DatabaseAvailabilityGroupServer DAG1 -MailboxServer D-EMAIL02 - ?

    Do I need to re-seed from scratch by updating the database copy?

    Thanks
    SMI

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  4. SMI 1 Reputation point
    2020-12-04T21:00:19.49+00:00

    Hi,

    Getting this error when I try - Start-DatabaseAvailabilityGroup DAG1 -MailboxServer D-EMAIL02

    WARNING: The operation wasn't successful because an error was encountered. You may find more details in log file
    "C:\ExchangeSetupLogs\DagTasks\dagtask_2020-12-04_20-57-47.659_start-databaseavailabilitygroup.log" on "D-EMAIL02".
    You can run this command on a database availability group (DAG) only when the DatacenterActivationMode parameter for
    the DAG is set to DagOnly

  5. Andy David - MVP 142.2K Reputation points MVP
    2020-12-05T13:53:08.157+00:00

    I would remove the server from the DAG if it lets you. ( Remove all the database copies first)
    Then try to re-add back to the DAG, if that fails, consider simply removing Exchange at that point and rebuilding the server from scratch and then re-adding back to the DAG and re-adding mailbox copies.

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