Migration from 2.5 to 3.4

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Hello.

In the next week I'm changing a couple of servers where 2.5 is running and I'm thinking of taking advance of this opportunity to migrate to 3.4.
I've never performed a replication before, though.

My idea would be:
_ set up the new server as replica;
_ set up the old as master;
_ call sync_client a few time;
_ firewall the old server so that it receives no changes from clients or MTA;
_ call sync_client the last time;
_ shut down the old server;
_ change the IP of the new server to be the same as the old one;
_ remove the replica settings.

Is this list correct?
Unfortunately I see the failover chapter is still missing from the docs...

 bye & Thanks
       av.

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