Veritas Cluster Server Bundled Agents Reference Guide

16
Introducing VCS bundled agents
Resources and their attributes
This document describes the VCS bundled agents along with their resource type
definitions, attribute definitions, and sample configurations. The chapter on
configuring resources and applications in the Veritas Cluster Server Administrator's
Guide describes how to configure these agents.
Resources and their attributes
Resources are the key parts of a system and are known by their type, such as a
disk, a volume, or an IP address. Resource types are defined in the types.cf file by
a collection of attributes. The VCS configuration file, main.cf, contains the values
for the resource attributes and has an include directive to the types.cf file.
There are three categories of resources: On-Off, On-Only, and Persistent. The
category of a resource governs the functions that the corresponding agent
performs. For example, if the resources of an agent are of type On-Off, the agent
could online and offline the resources. If the resources of an agent are of type
On-Only, the agent could online the resources but cannot offline them. For
persistent resources, the agent can neither online nor offline a resource.
An attribute's given value configures the resource to function in a specific way.
By modifying the value of a resource attribute, you can change the way the VCS
agent manages the resource. For example, the IP agent monitors an IP address
resource. The specific address to be monitored is identified by the attribute Address
whose value is the specific IP address.
Modifying agents and their resources
Use Cluster Manager (Java Console) or the VCS command line to dynamically
modify the configuration of the resources managed by an agent.
See the Veritas Cluster Server Administrator's Guide for instructions on how to
complete these tasks.
Attributes
Configure VCS components with attributes. Attributes contain data about the
cluster, systems, service groups, resources, resource types, agent, and
heartbeats—if you want to use global clusters. Each attribute has a definition and
a value. Some attributes also have default values.
Attribute data types
Table 1-1 summarizes the attribute data types for VCS and their values.