@Joseph Hawkins - You can just have the value as "/grid/hadoop/hdfs/dn,/grid1/hadoop/hdfs/dn" if they are simple directories on the file system. This is the list of directories where the data will be stored. However, if you have Heterogeneous storage (like DISK, SSD, ARCHIVE or RAM_DISK) you would need to append the File URI. Below is a very good article explaining HDFS Metadata Directories: https://hortonworks.com/blog/hdfs-metadata-directories-explained/ ... View more