Using HDFS Storage Locations
Vertica stores data in its native format, ROS, in storage locations. You can place storage locations on the local Linux file system or in HDFS. If you are using Premium Edition, you typically use HDFS storage locations for lower-priority data. Doing so frees space on your Vertica cluster for higher-priority data. If you are using Vertica for SQL on Apache Hadoop, you typically place ROS data only on HDFS.
If you use HDFS storage locations, the HDFS data must be available when you start Vertica. Your HDFS cluster must be operational, and the ROS files must be present. If you moved data files, or they are corrupted, or your HDFS cluster is not responsive, Vertica cannot start.