I  am using  CM and CDH 5.10.2 with 100+ nodes and we intend to upgrade to 6.0 express. As per the documentation here,  https://community.cloudera.com/t5/Product-Announcements/ANNOUNCE-Cloudera-Manager-6-1-Express-functionality-change/td-p/84180 it is mentioned that with Express versions, CM will not allow you to upgrade to any CDH 6.x version if the number of nodes are greater than 100. But it is also mentioned that if any upgrade to CM 6.1 fails (with express option)  then we need to downgrade the CM to 6.0 and then remove some nodes to make the nodes limit to be less than 100. Also as per this doc ,https://docs.cloudera.com/documentation/enterprise/6/release-notes/topics/rg_cm_610_new_features.html#concept_y4v_rn4_bgb  the affected versions of this 100 node limit is from CM 6.1 and higher.   Is it that, CM 6.0 and CDH 6.0.x versions of the express support  100+ nodes in the cluster?   Can we have have express versions of CM 6.0 and CDH 6.0 and have more than 100+ nodes and use all the Cluster Management functionality using CM like service restarts, config deployment, etc. Any clarification on this 100+ nodes limit w.r.t CM and CDH 6 express versions would be appreciated.   Here are the Cloudera links, https://docs.cloudera.com/documentation/enterprise/latest/topics/cm_ag_licenses.html https://community.cloudera.com/t5/Product-Announcements/ANNOUNCE-Cloudera-Manager-6-1-Express-functionality-change/td-p/84180 https://community.cloudera.com/t5/Support-Questions/Max-no-of-nodes-can-be-managed-by-Cloudea/td-p/80786 ... View more