Designing Resource Types

This chapter explains the typical use of the Data Service Development Library (DSDL) in designing and implementing resource types. This chapter also focuses on designing the resource type to validate the resource configuration, and to start, stop, and monitor the resource. In addition, this chapter describes how to use the DSDL to implement the resource type callback methods.

See the rt_callbacks(1HA) man page for additional information.

You need access to the resource's property settings to complete these tasks. The DSDL utility scds_initialize() provides a uniform way to access these resource properties. This function is designed to be called at the beginning of each callback method. This utility function retrieves all the properties for a resource from the cluster framework and makes it available to the family of scds_getname() functions.

This chapter covers the following topics:

• Resource Type Registration File

• Validate Method

• Start Method

• Stop Method

• Monitor_start Method

• Monitor_stop Method

• Monitor_check Method

• Update Method

• Description of Init, Fini, and Boot Methods

• Designing the Fault Monitor Daemon