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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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## Overview of Modifying a Resource Type

Cluster administrators must be able to carry out the following tasks:

- Install and register a new version of an existing resource type

- Allow the registration of multiple versions of a given resource type

- Upgrade an existing resource to a new version of the resource type without having to delete and recreate the resource

A resource type that you intend to upgrade is called an upgrade-aware resource type.

Elements of an existing resource type that you might change are as follows:

- Attributes of resource type properties

- The set of declared resource properties, including standard and extension properties

- Attributes of resource properties, such as `default`, `min`, `max`, `arraymin`, `arraymax`, or `tunability`

- The set of declared methods

- The implementation of methods or monitors

Note - You do not necessarily have to modify a resource type when you modify application code.

You need to understand the requirements for providing the tools that will enable a cluster administrator to upgrade a resource type. This chapter tells you what you need to know to set up these tools.

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