As a part of my independent consulting, I also provide a high level overview of the migration strategy. As a part of this engagement, my client wanted me to provide steps to move AlwaysOn availability group from DomainOld to DomainNew. This was happening because they were acquired by another company and they need to migrate all assets to a new domain.



Here are the steps which I told them.

  • Remove replica Node-03 from availability group.
  • Evict Node-03 from the windows cluster.
  • Since Node-03 is completely out of AG, we can rebuild Node-03 in DomainNew
  • Create a new windows cluster having just one node Node-03.
  • Use scripts to migrate all server level objects – logins, jobs, operators from Node-01 to Node-03.
  • Node-02 also needs same steps as Node-03 with one difference that it would be part of the same cluster as Node-03 rather than new cluster.
  • Configure database mirroring for user databases from Node-01 to Node-03.
  • OUTAGE: failover mirror databases to Node03, break the mirror and point application to Node-03.
  • Perform test and test and test.
  • Evict Node-01 and decommission the original cluster.
  • Rebuild Node-01 in the new domain and add it to the cluster.
  • Backup and restore the database from the Node-03 to the two new nodes and implement AG across all three new nodes.

After getting above high level guidance, they executed the project and it went fine.

Hope this step would help others as well about AlwaysOn Availability Group.

Reference: Pinal Dave ( 

About the Author

Pinal Dave

Pinal Dave is a Microsoft Technology Evangelist (Database and BI). He has written over 1700 articles on the subject on his blog at He is a dynamic and proficient Principal Database Architect who specializes in SQL Server Performance Tuning and has 7+ years of hands-on experience. He holds a Masters of Science degree and a number of certifications, including MCTS, MCDBA and MCAD (.NET). He is also Regional Mentor for PASS Asia. Prior to joining Microsoft he was awarded Microsoft MVP award for three continuous years for his contribution in community.

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