1. Introduction

Archival storage lets you store data on physical media with high storage density and low processing resources.

Implementing archival storage involves the following steps:

  1. Shut down the DataNode.

  2. Assign the ARCHIVE storage type to DataNodes designed for archival storage.

  3. Set HOT, WARM, or COLD storage policies on HDFS files and directories.

  4. Restart the DataNode.

If you update a storage policy setting on a file or directory, you must use the HDFS mover data migration tool to actually move blocks as specified by the new storage policy.