Hi @Sedat Kestepe, take a look at rack awareness. https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-common/RackAwareness.html Here's how you can configure racks using Ambari https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.0.0/bk_Ambari_Users_Guide/content/ch03s11.html HDFS will avoid placing all block replicas in the same rack to avoid data loss in case of a rack failure. You may be able to use this to achieve what you want. ... View more

@Riccardo Iacomini, are you asking about the HDFS move/rename command? Move is purely a metadata operation on the NameNode and does not result in any data movement until the HDFS Mover utility is run. https://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-hdfs/ArchivalStorage.html#Mover_-_A_New_Data_Migration_Tool Edit: The Mover will move blocks within the same node when possible and thus try to avoid network activity. If that is not possible (e.g. when a node doesn't have SSD or when the local SSDs are full), it will move block replicas across the network to another node that has the target media. ... View more