https://community.cloudera.com/t5/Support-Questions/How-to-increase-DFS-space-on-existing-cluster/m-p/187840#M149941 <P>As you have heterogeneous worker nodes, I'd recommend setting up two separate host config groups first, then manage HDFS separately.</P><P>Here is the link to how to set up config groups in Ambari: </P><P><A href="https://docs.hortonworks.com/HDPDocuments/Ambari-2.5.1.0/bk_ambari-operations/content/using_host_config_groups.html" target="_blank">https://docs.hortonworks.com/HDPDocuments/Ambari-2.5.1.0/bk_ambari-operations/content/using_host_config_groups.html</A></P><P>For each host group, you can config the non DSF use by setting the proper value for 'dfs.datanode.du.reserved' (<STRONG>in bytes per volume</STRONG>), normally it should be 20%- 25% of disk storage. </P><P>Also, keep in mind non DFS can grow into reserved DFS storage, you should regularly delete logs and other non HDFS data that are taking large local storage, I normally use commands like 'du -hsx * | sort -rh | head -10' to identify top 10 largest folders. </P> Tue, 18 Jul 2017 00:10:22 GMT dsun 2017-07-18T00:10:22Z