HPE Ezmeral Data Fabric 6.1.x is In Maintenance and transitions to "End of Maintenance" in June 2024. Please see the latest documentation.

About MapR 6.1
This site contains the main documentation for Version 6.1 of the MapR Converged Data Platform, including installation, configuration, administration, and reference information.
6.1 Installation
This section contains information about installing and upgrading MapR software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a MapR cluster.
6.1 MapR Data Platform
MapR Data Platform is the industry-leading data platform for AI and analytics that solves enterprise business needs.
6.1 Administration
This section describes how to manage the nodes and services that make up a cluster.
- Administering Users and Clusters
  Lists topics that help manage a MapR cluster.
- Administering Nodes
  Provides a synopsis of managing nodes in a cluster.
  - Managing Nodes
    Describes the Nodes page on the Control System.
  - Managing Roles
    Describes how to manage roles on a node.
  - Managing Services
    Synopsis on managing services.
  - Managing Disks
    Provides a brief overview of adding and removing disks from the MapR file system.
    - Viewing the List of Disks
      Explains how to view the disks on a node using either the Control System or the CLI.
    - Setting Up Disks for MapR
      This section describes how to set up disks during the normal installation process. Go to the ReferenceGuide/disksetup.html command page for information about other uses of this command.
    - Adding Disks to MapR File System
      Describes how to add disks using either the Control System or the CLI.
    - Removing Disks from the File System
      Explains how to remove disks using either the Control System or the CLI.
    - Determining the Amount of Free Disk From the Command-Line
      Lists the command to display the amount of free disk space.
    - Tolerating Slow Disks
      Explains how to tune disk response timeouts.
    - Formatting Disks on a Node From the Command-line
      Provides an overview of the disksetup script to format disks from the command line.
    - Handling Disk Failures
      Explains how to handle disk failures.
    - Designating NICs for MapR
      Explains how to assign IP address blocks for MapR.
    - Working with a Logical Volume Manager
      Explains the role and usage of a Logical Volume Manager.
    - Tuning for SSDs
      Lists the parameters to tune for optimal SSD performance.
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of MapR clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the MapR Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the MapR Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. MapR Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering MapR Gateways
  A MapR gateway mediates one-way communication between a source MapR cluster and a destination cluster. You can replicate MapR Database tables (binary and JSON) and MapR Event Store For Apache Kafka streams. MapR gateways also apply updates from JSON tables to their secondary indexes and propagate Change Data Capture (CDC) logs.
- Administering Services
- Monitoring the Cluster
  This section describes how to monitor the health and performance of a MapR cluster.
- Configuring Security
  Describes how to configure security and manage secure clusters.
- Managing Secure Clusters
  Provides procedures that will enable you to use MapR clusters securely.
- Administering the MapR Data Access Gateway
  The MapR Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the MapR cluster. This section describes considerations when upgrading the service, how to modify configuration settings, and how to administer and manage the service.
- Planning for High Availability
- Administrator's Reference
  This section contains in-depth reference information for the administrator.
- Troubleshooting Cluster Administration
  Lists the common errors and their solutions.
- Best Practices for Backing Up MapR Information
  Lists the best practices and performance considerations to follow when backing up MapR information.
6.1 Development
This section contains information related to application development for Ezmeral ecosystem components and MapR Data Platform products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: MapR Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other MapR version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

Determining the Amount of Free Disk From the Command-Line

Lists the command to display the amount of free disk space.

To determine the amount of used and available disk space on the file system, run df -h. When running this command, if:

The given path points to the mount point, the output will display used and available disk space for the entire cluster. For example:

[root@atsqa6c69 ~]df -h /mapr/clus.posix/
Filesystem            Size  Used  Avail  Use%  Mounted on 
posix-client-basic    4.4T  9.7G  4.4T   1%    /mapr

The given path points to a volume with no (hard) quota, the output will display used and available disk space for the entire cluster. For example:
```
[root@atsqa6c69 ~]df -h /mapr/clus.posix/vol3
Filesystem          Size  Used  Avail  Use%  Mounted on
posix-client-basic  4.4T  9.7G  4.4T   1%    /mapr
```
The given path points to a volume with (hard) quota set, the output will display the used and available disk space for the specific volume based on the allocated quota. For example:
```
[root@atsqa6c69 ~]df -h /mapr/clus.posix/vol2/
Filesystem          Size  Used  Avail  Use%  Mounted on
posix-client-basic  5.0G  2.5G  2.6G   49%   /mapr
```