About Release 7.6.1
This site contains documentation for HPE Ezmeral Data Fabric release 7.6.1, including installation, configuration, administration, and reference content, as well as content for the associated ecosystem components and drivers.
7.6.1 Installation
This section contains information about installing and upgrading HPE Ezmeral Data Fabric software. It also contains information about how to migrate data and applications from an Apache Hadoop cluster to a HPE Ezmeral Data Fabric cluster.
7.6.1 Data Fabric
HPE Ezmeral Data Fabric is the industry-leading data platform for AI and analytics that solves enterprise business needs.
7.6.1 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 data-fabric cluster.
  - Managing Users and Groups
    Provides a brief introduction to user management on an HPE Ezmeral Data Fabric cluster.
  - Managing the Cluster
    Lists the settings for managing the data-fabric cluster.
    - Managing Auditing
      Provides instructions for using data-fabric auditing features.
    - Configuring Balancer Settings
      Provides an overview of the HPE Ezmeral Data Fabric disk space and replication role balancers.
    - Managing Licenses
      Provides a synopsis of adding licenses using the Control System and the CLI.
    - Setting Quota Defaults for Users and Groups
      Explains how to set disk space quotas for users and groups.
    - Specifying the Location of Gateways
      Describes how to set the location of the HPE Ezmeral Data Fabric gateways using either the Control System or the CLI.
    - Managing Alarms
    - Working with Multiple Instances of the File System
      The Multi-file system feature allows multiple instances of the file server to run on a single node in a single process.
      - Configuring the Number of Storage Pools per Instance
        Describes how to set the number of storage pools for each file system instance, from the CLI.
      - Monitoring Multiple Instances of the File System
        Describes how to monitor the health and performance of your cluster.
    - Converting a Cluster from Root to Non-Root User from the Command-Line
      Provides a synopsis of changing the running user from root to a non-root user on a cluster.
    - Starting Up a Cluster
      Lists the steps to start a cluster that was previously shut down.
    - Shutting Down a Cluster
      Lists the considerations to note and the procedure to shutdown a cluster.
    - Allocating Cluster Resource from the Command-Line
      Provides a general overview on allocating cluster resources for a data-fabric Hadoop cluster.
- Administering Nodes
  Provides a synopsis of managing nodes in a cluster.
- Administering Volumes
  This section provide information about how to organize and manage data using volumes, a unique feature of HPE Ezmeral Data Fabric clusters.
- Administering Files and Directories
- Administering Tables
  Administration of the HPE Ezmeral Data Fabric Database is done primarily via the command line (maprcli) or with the Managed Control System (MCS). Regardless of whether the HPE Ezmeral Data Fabric Database table is used for binary files or JSON documents, the same types of commands are used with slightly different parameter options. HPE Ezmeral Data Fabric Database administration is associated with tables, columns and column families, and table regions.
- Administering Streams
- Administering Data Fabric Gateways
  A HPE Ezmeral Data Fabric gateway mediates one-way communication between a source HPE Ezmeral Data Fabric cluster and a destination cluster. You can replicate HPE Ezmeral Data Fabric Database tables (binary and JSON) and HPE Ezmeral Data Fabric Streams streams. HPE Ezmeral Data Fabric 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 Data Access Gateway
  The HPE Ezmeral Data Fabric Data Access Gateway is a service that acts as a proxy and gateway for translating requests between lightweight client applications and the HPE Ezmeral Data Fabric 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 HPE Ezmeral Data Fabric Information
  Lists the best practices and performance considerations to follow when backing up HPE Ezmeral Data Fabric information.
- IPv6 Support in Data Fabric
  Describes the IPv6 support feature for Data Fabric.
7.6.1 Development
This section contains information related to application development for Ezmeral ecosystem components and HPE Ezmeral Data Fabric products, including the file system, Database (Key-Value and JSON), and Event Streams.
Other Docs
This section contains release-independent information, including: Installer documentation, Ecosystem release notes, interoperability matrices, security vulnerabilities, and links to other data-fabric version documentation.
Glossary
Definitions for commonly used terms in MapR Converged Data Platform environments.

Configuring the Number of Storage Pools per Instance

Describes how to set the number of storage pools for each file system instance, from the CLI.

About this task

As you add file system instances, data-fabric assigns SPs to them. If file system instances are removed, the SPs assigned to those instances are re-allocated among the remaining live file system instances. By default, the value is 1, which implies that there is only 1 SP for all instances. You can re-configure the number of SPs per instance globally or at the node-level.

NOTE If the number of file system instances is not as configured, the Instance Mismatch Alarm will be raised. If the alarm is raised on a:

CLDB node, restart warden by running the following command:
```
service mapr-warden restart
```
Non-CLDB node, restart file server by running the following command:
```
maprcli node services -nodes <node-ip> -fileserver restart
```

Global Configuration

About this task

If you configure globally, the configuration will be applied to all the nodes in the cluster. Make the following changes only on homogeneous clusters (that is, when all nodes in the cluster have the same type of disks and the stripe width of the disks is the same):

Procedure

Run the following commands:
```
maprcli config save -values {multimfs.numsps.perinstance:3}
maprcli config save -values {multimfs.numinstances.pernode:2}
```
The default value of the multimfs.numsps.perinstance parameter is 0. Suppose a node reports 9 SPs:
- For a value of 3, the node would need to start 3 instances.
- For a value of 5, the node would need to start 2 instances.
For clusters with fast SSDs, this can be set to 1.
NOTE On AWS nodes with HDD, set the multimfs.numsps.perinstance parameter value to 50 to use a single instance.
Restart Warden in every node for the configuration change to take effect.

Node-level Configuration

About this task

At the node level, you can configure different number of instances for each node in the cluster. To change the number of SPs per instance:

Procedure

Run the following command:
```
maprcli node modify -nodes <nodename> -numSpsPerInstance <n>
```
The number of instances changes automatically when new SPs are created.
Restart Warden on the nodes where the configuration has changed.