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Dear experts,
Trying to write an instruction for how to perform a complete disaster recovery of all our (4 in one DAG) Exchange 2016 servers in the same organisation. Let us say they all have had complete software failure at the same time and needs to be completely reinstalled.
As I understand I need to follow https://learn.microsoft.com/en-us/exchange/high-availability/disaster-recovery/recover-exchange-servers?view=exchserver-2019 and then set up the DAG again before restoreing mailbox databases. Is this correct?
Thanks for input and assistance.
Regards,
Mrtro
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Hi @mrtro-1199 ,
Welcome to our forum.
Did Andy's reply help you? If it was helpful, please "Accept Answer", this will make answer searching in the forum easier and be beneficial to other community members as well.
Thanks.
You prob would want to follow this instead and recover each server one at a time and re-add to the DAG.
https://learn.microsoft.com/en-us/exchange/high-availability/disaster-recovery/recover-dag-member-servers?view=exchserver-2019
Thanks for your answer AndyDavid
I'm not sure how I could run those commands if I first have an Exchange server, see 1-3 powershell commands.
Would I not have to start with the first server (after OS installation) and run setup.exe /Mode:RecoverServer to get a Exchange server up and running?
Regards,
Mrtro
Hi @mrtro-1199 ,
Please open Exchange Management Powershell (EMS) and run the following command:
1.Retrieve any replay lag or truncation lag settings for any mailbox database copies that exist on the server being recovered.
Get-MailboxDatabase DB1 | Format-List *lag*
2.Remove any mailbox database copies that exist on the server being recovered
Remove-MailboxDatabaseCopy DB1\MBX1
3.Remove the failed server's configuration from the DAG
Remove-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer MBX1
4.Reset the server's computer account in Active Directory
5.Open a Command Prompt window and run Setup /m:RecoverServer
6.When the Setup recovery process is complete, add the recovered server to the DAG
Add-DatabaseAvailabilityGroupServer -Identity DAG1 -MailboxServer MBX1
7.reconfigure mailbox database copies
Add-MailboxDatabaseCopy -Identity DB1 -MailboxServer MBX1
For detailed steps, you can refer to the link provided by Andy.
Warm thanks.
Hi,
Besides，you need to select the Exchange server you want to recover to run setup .exe /Mode:RecoverServer, you don't have to start with the first one.
Have a nice day :)
Thanks again for your input. So if I understand this correctly, the procedure for recovery from scratch (but with a recovered AD) would be:
Am I on the right track?
Regards,
Mrtro
Hi @mrtro-1199 ,
Yes.
If you do not have the installation media for the Cumulative Update (CU) version that was installed on the server to be recovered, you can recover a server using the latest available Cumulative Update.
You could refer to the detailed information of the following articles:
recover-exchange-dag-member-server
Please Note: Since these web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of this information.
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