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SQL migration from 2008 R2 to 2017 always on

Hello, I am trying to migrate from the existing 2 node cluster 2008R2( data center A) to 4 node always on 2017 ( Node 1 and Node2( Data center B) and (Node3, node4) are in Data center C. Synchrnous between N1 and N2 and asynchrnous N3,N4), Looking for shortest downtime possible the databases size is close to 8 TB Thanks

migrationsql server 2008 r2always-onsql server 2017
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