List disks for a hortonworks node
# cat /var/lib/ambari-agent/data/datanode/dfs_data_dir_mount.hist
# This file keeps track of the last known mount-point for each dir.
# It is safe to delete, since it will get regenerated the next time that the component of the service starts.
# However, it is not advised to delete this file since Ambari may
# re-create a dir that used to be mounted on a drive but is now mounted on the root.
# Comments begin with a hash (#) symbol