I'm looking for some general recommendations on a fairly large Cassandra data center migration. We are currently running Cassandra 2.1.15 in AWS and will be moving to DSE 5.x running 3.11. My current plan is to update 2.1.15 to 3.11 then setup replication between the two DC's. We have a lot of data, in the region of 150TB.
Any tips and tricks, best practices and potential issues we can expect would be awesome.