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Hitachi Vantara Knowledge

System scaling

You manage how the system scales by adding or removing instances to the system and also by specifying which services run on those instances.


An instance is a server or virtual machine on which the software is running. A system can have either a single instance or multiple instances. Multi-instance systems have a minimum of four instances.

A system with multiple instances maintains higher availability in the event of instance failures. Additionally, a system with more instances can run tasks concurrently and can typically process tasks faster than a system with fewer or only one instance.

A multi-instance system has two types of instances: master instances, which run an essential set of services, and non-master instances, which are called workers.


Each instance runs a configurable set of services, each of which performs a specific function. For example, the Metadata Gateway service stores metadata persistently.

In a single-instance system, that instance runs all services. In a multi-instance system, services can be distributed across all instances.


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