HP OpenVMS Alpha Partitioning and Galaxy Guide |
OpenVMS Galaxy Configuration Utility |
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The GCU converts and extends the binary representation of the configuration file into a simple ASCII representation, which it can store in a file as an offline model. The GCU can later reload an offline model and alter the system configuration to match the model. Whether you are viewing the active model or an offline model, you can save the current configuration as an offline Galaxy Configuration Model (.GCM) file.
To make an offline model drive the current system configuration, the model must be loaded and engaged. To engage a model, click the Engage button. The GCU scans the current configuration file, compare it against the model, and create a list of any management actions that are required to engage the model. The GCU presents this list to you for final confirmation. If you approve, the GCU executes the actions, and the model is engaged to reflect the current system configuration and state.
When you disengage a model, the GCU immediately marks the CPUs and instances as off line. You can then arrange the model however you like, and either save the model, or reengage the model. In typical practice, you are likely to have a small number of models that have proved to be useful for your business operations. These can be engaged by a system manager or a suitably privileged user, or through DCL command procedures.
Active Model ![]()
The GCU maintains
a single active model. This model is always derived from the in-memory
configuration file. The configuration file can be from a Galaxy
console or from a file-based, single-instance Galaxy on any Alpha
system. Regardless of its source, console callbacks maintain the
integrity of the file.
The GCU utilizes Galaxy event services to determine when a configuration change has occurred. When a change occurs, the GCU parses the configuration file and updates its active model to reflect the current system. The active model is not saved to a file unless you choose to save it as an offline model. Typically, the active model becomes the basis for creating additional models. When creating models, it is generally best to do so online so that you are sure your offline models can engage when they are needed.
Offline Models ![]()
The GCU can load
any number of offline Galaxy configuration models and freely switch
among them, assuming they were created for the specific system hardware.
The model representation is a simple ASCII data definition format.
You should never need to edit a model file in its ASCII form. The GCU models and ruleset adhere to a simple proprietary language known as the Galaxy Configuration Language (GCL). This language continues to evolve as needed to represent new Galaxy innovations. Note this fact if you decide to explore the model and ruleset files directly. If you accidentally corrupt a model, you can always generate another. If you corrupt the ruleset, you may need to download another from the OpenVMS Galaxy web site.
Example: Creating an Offline Model ![]()
To create an offline Galaxy configuration model:
To engage an offline model:
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