When you install a domain, the usage profile you select determines the features that are available by default. Here is a summary of the usage profiles:
developer profile - Provides a lightweight feature set optimized for developers, with one server instance and no clustering features.
cluster profile - Provides the complete GlassFish feature set, including clustering features.
For more information about usage profiles, see Usage Profiles in Sun GlassFish Communications Server 2.0 Administration Guide.