Singleton classes are used to create new custom appliances that are derived from existing appliance instances. A singleton class is created by branching an instance of an appliance. See Branching Classes for more information about how create a new singleton by branching an existing appliance.
Singleton classes are designated by an S in the upper right corner. Singletons can be freely modified; all modifications are preserved across application starts and stops (unlike appliance instances where CA AppLogic® for System z may re-instantiate their volumes and any changes made to those volumes would be lost). In addition, the singleton class with its volumes are a permanent part of the application. If the application is copied/migrated to another grid, the singleton class and its corresponding volumes are also copied/migrated with the application.
If an appliance does not have the S in its upper right corner, the appliance is an appliance instance. Any changes that are made to an appliance instance may be lost (such as modifying the boot volume).
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