Perry Whittle (1/28/2015)

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muthukkumaran Kaliyamoorthy (1/28/2015)

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Yes, Correct. Server A & B old - SQL 2012. And need to move it to server C & D new - SQL2014.

So, you have two options

The first option involves joining ServerC and ServerD to the same Windows Server Failover Cluster as ServerA and ServerB.

You then restore a backup of the large database onto C and D and then join the instances to the same Availability group as A and B. Once the database has synchronised you failover the group to either C or D and the database is at SQL Server 2014.

To clean up you remove A and B from the AlwaysOn group and then if necessary remove the servers from the Windows Server Failover Cluster.

The second option involves setting up C and D in a new Windows Server Failover Cluster (which it sounds like you may have already done) and creating a cross cluster migration. There is a document provided by Microsoft on how to achieve this, you can find it at this link.