Ways to Create a Service That Uses GDS

There are two ways to create a service that uses the GDS:

• Using the SunPlex Agent Builder

• Using the standard Sun Cluster administration commands

GDS and the SunPlex Agent Builder

Use the SunPlex Agent Builder and select GDS as the type of generated source code. The user input is used to generate a set of driving scripts that configure resources for the given application.

GDS and the Standard Sun Cluster Administration Commands

This method uses the precompiled data service code in SUNWscgds but requires that the system administrator use the standard Sun Cluster administration commands (scrgadm(1M) and scswitch(1M)) to create and configure the resource.

Selecting the Method to Use to Create a GDS-Based Service

As shown in the procedures How to Use Sun Cluster Administration Commands to Create a Highly Available Service Using GDS and Standard Sun Cluster Administration Commands to Create a Scalable Service Using GDS, a significant amount of typing is required to issue the appropriate scrgadm and scswitch commands.

Using the GDS with SunPlex Agent Builder simplifies the process because it generates the driving scripts that issue the scrgadm and scswitch commands for you.

When Is GDS Not Appropriate

While using the GDS has many advantages, there are instances when it is not appropriate to use the GDS. The GDS is not appropriate:

• When more control is required than is available using the precompiled resource type. such as when you need to add extension properties or change the defaults.

• When the source code needs to be modified to add special functions.

• When you want to use multiple process trees.

• When you want to use non-network-aware applications.