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Best way to change primary node in 4 node AO cluster

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Hi,

I have a 4 node cluster where i will remove 2 nodes that are currently primary sync and secondary sync and let the secondary sync/async nodes remain but as new primary and new secondary (because we are removing two nodes from vmware and will be left with 2 nodes on hyper-v)

I have an identical setup in test and am experiencing very long failover times when moving roles. What is the best way to move primary and secondary sync roles from nodes N1 and N2 to N3 and N4 respectively. Please refer to picture.


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