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.
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