Plan Initial Volumes

This section describes why it is important to define volumes.

MapR manages the data in a cluster in a set of volumes. Volumes can be mounted in the Linux filesystem in a hierarchical directory structure, but volumes do not contain other volumes. Each volume has its own policies and other settings, so it is important to define a number of volumes in order to segregate and classify your data.

Plan to define volumes for each user, for each project, and so on. For streaming data, you might plan to create a new volume to store new data every day or week or month. The more volume granularity, the easier it is to specify backup or other policies for subsets of the data. For more information on volumes, see Managing Data with Volumes.