Using CA AppLogic › Appliance Developer Guide › Appliance Overview › Configure Appliance › Set Class Boundary › Resources

Resources

Resources identify the minimum, maximum, and default amount of CPU, memory, and bandwidth required by the appliance. The actual resource amount is determined at start time and is calculated based on the resource range of all appliances used in the application. These values can remain as-is or you can add further constraints by setting a resource range.

The resource range has the scope of the appliance class and is stored persistently in the appliance class descriptor. Typically, the class range is defined based on the software that is going to be placed in the appliance class. The operating system and application-specific software can impose limits. For example, a database server may require a minimum of 2GB RAM to run and not scale well above 4 CPU cores. In this case, a mem.min of 2GB and cpu.max of 4 makes sense. Bandwidth affects only terminals of an appliance, not the external interfaces.

Follow these steps:

1. On the Resources tab, specify the resource level for resources, such as memory, CPU, and bandwidth, as needed. The resource levels are Min, Max, and Default.
   • Min and Max - specifies the minimum and maximum value that should be allowed for the given resource. This means that if, for example, an entity has a min=1GB and max=4GB for memory, you cannot allow specify less than 1GB or more than 4GB for that resource. The actual resource amount is determined at start time -- start of the application or of the appliance. At that time, an actual value is calculated and provided for the entity. The resource amount then does not change until the entity is stopped.
   • Default - indicates the actual resource value that will be provided to the entity, if no explicit value is provided. For example, if you have an appliance that has memory resource defined as min=1GB, max=4GB, default=2GB, and no explicit value is provided, the appliance receives the default value of 2GB.

   You could also specify actual values. These can be specified in several ways – explicitly on the instance by changing its default or by inference from a higher-level entity. The actual values may be defined persistently in the CA AppLogic ADL descriptors or ad-hoc when starting or restarting an application or appliance.

2. To continue, select the Notes tab.
3. Define the parameters and data, as need.
4. To save, click OK.

   The Infrastructure Editor displays.

5. Click Save.