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| Oracle Solaris Cluster Data Service for MySQL Cluster Guide Oracle Solaris Cluster 4.1

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## HA for MySQL Cluster Overview

HA for MySQL Cluster enables the Oracle Solaris Cluster software to manage MySQL Cluster by providing components to perform the orderly startup, shutdown, and fault monitoring of the MySQL Cluster processes. When a MySQL Cluster database cluster is managed by the HA for MySQL Cluster data service, the MySQL Cluster instances become scalable or multiple-master resources across the Oracle Solaris Cluster nodes.

A MySQL Cluster instance on top of Oracle Solaris Cluster software consists of the `ndbd` server, the `ndb` management server, the `ndb` shutdown controller, and MySQL Servers. You can configure HA for MySQL Cluster components as a scalable or multiple-master service. You cannot configure HA for MySQL Cluster components as a failover service. The only exception is the MySQL Server component.

For conceptual information about failover data services, multiple-masters data services, and scalable data services, see Oracle Solaris Cluster Concepts Guide.

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