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Online Versus Offline Models  



The GCU allows you to display and interact with the active (online) or inactive (offline) Galaxy configuration models. When the configuration display represents a model of the active system, the GCU displays the state of the CPUs and instances using color and text. When the configuration model is engaged in this manner, you can interact with the active system using drag-and-drop procedures. The formal description for this mode of operation is interacting with the engaged, online model.

GCU users can also interact with any number of disengaged, or offline, models. Offline models can be saved to or loaded from files. An offline model can also be derived from the active online model by clicking the Engage button to be disengaged when the active online model is displayed. In addition to the visual state of the Engage button, the GCU also indicates the online versus offline characteristic of the CPUs and instances by using color and text. Any drag-and-drop actions directed at an offline model are interpreted as simple editing functions. They change the internal structure of the model but do not affect the active system.

When an offline model is engaged, the GCU compares the structure of the model with that of the active system. If they agree, the offline model is engaged and its new online state is indicated with color and text. If they do not agree, the GCU determines what management actions would be required to alter the active system to match the proposed model. A list of the resulting management actions is presented to the user, and the user is asked whether they would like to execute the action list. If the user disapproves, the model remains off line and disengaged. If the user approves, the GCU executes the management actions and the resulting model is displayed as on line and engaged.


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