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Unable to remove dead server from DAG

I am trying to remove the dead server from Exchange DAG using below command but getting following error. I have truobleshoot this case and it seems that MBx05 object has been deleted from computer OU and now not sure how to cater this situation.

Remove-DatabaseAvailabilityGroupServer -Identity DAG02 -MailboxServer MBX05.mydomain.com -ConfigurationOnly

The fully qualified domain name for node 'MBX05' could not be found.
+ CategoryInfo : NotSpecified: (:) [Remove-DatabaseAvailabilityGroupServer], AmGetFqdnFailedNotFoundExcep
tion
+ FullyQualifiedErrorId : [Server=MBX03,RequestId=f99b4c53-017f-4274-aa1a-fcad30ca8db2,TimeStamp=2/7/2018 8:10:55
AM] [FailureCategory=Cmdlet-AmGetFqdnFailedNotFoundException] DFE44AB2,Microsoft.Exchange.Management.SystemConfigu
rationTasks.RemoveDatabaseAvailabilityGroupServer
+ PSComputerName : mbx03.domain-name.com

ASKER CERTIFIED SOLUTION

Hasin Ahmed Choudhary

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Muhammad Asif

ASKER

No I am not able to find it. It seems that some how it has been removed. So what should now we need to do to remove it from DAG?

Hasin Ahmed Choudhary

If Computer name and AD object is removed from configuration partition, you will have to remove backlink of DAG to that server.

Search for that property in ADSiedit under dag properties and edit and remove the dead server from it.

Muhammad Asif

ASKER

Hi Hasin,

Can you please provide me complete path of dag properties in ADSIedit?

SOLUTION

Hasin Ahmed Choudhary

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Muhammad Asif

ASKER

The server is listing in ADSI edit at "services-->MicrosoftExchange-->Your OrgName-->AdministrativeGroups-->Exchange Adminsitrative Groups-->servers"

But not able to find it AD Object. Can I recreate the object with the dead server name and then try to run the command?

Hasin Ahmed Choudhary

Verify if you have selected entire directory while searching for the computer account.
Nope, that would have new Object GUID. Check if you can restore computer object from deleted items (AD recycle BIn). If you can't restore it, you are left with below option only.

1) Remove the server from DAG using backlink.
2) Delete server from configuration partition.

Muhammad Asif

ASKER

Hi,

Thanks for your help. I am able to get the object back and the server has been removed from the DAG by running the above mentioned command.

Now If I run the below command to check the witness server t hen it is showing WitnessShareInUse : None . How can I force the cluster to use the witness server.

Get-DatabaseAvailabilityGroup -status | fl *witne*

SOLUTION

Hasin Ahmed Choudhary

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Muhammad Asif

ASKER

Hi Hasin,

Thanks for your support on this case. I have run below command which you have mentioned and now primary witness server is in use.

Set-DatabaseAvailabilityGroup -Identity DAG02 -WitnessServer Server-FDQN-Name

Hasin Ahmed Choudhary

Great :)