Recovering Exchange Server DAG Member Node


If a Mailbox server that’s a member of a database availability group (DAG) is lost or fails, and is unrecoverable and needs replacement, you can run a server recovery operation.

Deployment of Underlying Physical/Virtual Machine & Base Windows Server OS

  • Provisioning of Physical/Virtual Machine (Virtual Disks in Thick Mode)
  • Installation & Configuration of Windows Server
  • Configuration of Partitions & Assigning Drive Letters (same as primary server)
  • Installation & Configuration of Prerequisites required for Exchange Server (according to the installed edition)

What you need to verify before begin

If Exchange is installed in a location other than the default location, you must use the /TargetDir Setup switch to specify the location of the Exchange program files. If you don’t use the /TargetDir switch, the Exchange program files will be installed in the default location (%programfiles%\Microsoft\Exchange Server\V15).

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To determine the install location, follow these steps:

  • Navigate to the following location: CN=ExServerName,CN=Servers,CN=First Administrative Group,CN=Administrative Groups,CN=ExOrg Name,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=DomainName,CN=Com
  • Right-click the Exchange server object, and then click Properties.
  • Locate the msExchInstallPath attribute. This attribute stores the current installation path.
  • Reset Computer Account (lost DAG server node) in Active Directory
  • Remove old passive DB copies
  • Remove lost DAG Node from DAG Interface in Exchange Admin Center

Note: If DAC Mode is enabled then you need to turn it off before removing old DAG membership.

Installation & Configuration of Exchange Server in Recover Mode

  1. Open up Windows PowerShell as Administrator
  2. Run the following command

Use /TargetDire Switch to give installation path (same as old was installed)

Setup /m:RecoverServer
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Post Installation Tasks

  • Configuration of Virtual Directories
  • Configuration of Internal/External DNS
  • Configuration of SSL Certificate

Finally !

Create Passive DB Copies and let them seed.

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