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I have an existing cluster, 43 nodes. Running RHEL 6.6, Ambari 2.4.2.0, HDP 2.5.3.0 not in HA mode. The servers are about 6 years old and we are looking to do a phased hardware refresh over a 3-year time frame.

Any suggestions on how to approach this? With the refresh I would like to upgrade to HDP 3.X and implement HA as well.