HDFS-2832 enables support for heterogeneous storages in HDFS, which allows DN as a collection of storages with different types. However, I can't find document on how to label different storage types from the following two documents. I found the information from the design spec. It will be good we document this for admins and users to use the related Archival storage and storage policy features.
This JIRA is opened to add document for the new storage type labels.
1. Add an example under ArchivalStorage.html#Configuration section:
2. Add a short description of [DISK/SSD/ARCHIVE/RAM_DISK] options in hdfs-default.xml#dfs.data.dir and document DISK as storage type if no storage type is labeled in the data node storage location configuration.