https://community.cloudera.com/t5/Support-Questions/The-health-test-result-for-DATA-NODE-SCM-HEALTH-has-become/m-p/44492#M8655 The first thing to do would be to look at the role log for the datanode that's not starting up. That'll typically have a stacktrace that points to what's wrong. Mon, 29 Aug 2016 19:47:34 GMT dspivak 2016-08-29T19:47:34Z