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 to create a new singleton.
Singleton classes are designated by a 1 in the lower right corner. Singletons can be freely modified; all modifications are preserved across application starts and stops (unlike appliance instances where CA AppLogic® may re-instantiate their volumes and any changes made to those volumes would be lost). In addition, the singleton class and its volumes are a permanent part of the application. If the application is copied or migrated to another grid, the singleton class and its corresponding volumes are also copied or /migrated with the application.
If an appliance does not have the 1 in its lower right corner, the appliance is an appliance instance. Any changes that are made to an appliance instance can be lost (such as modifying the boot volume).
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