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 To facilitate scaling up RAM for the VMs in xenserver  utilizes Dynamic Memory Control(DMC) to change the amount of host physical memory assigned to any running virtual machine without rebooting it.

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• 0 ≤ memory-static-min ≤ memory-dynamic-min ≤ memory-dynamic-max ≤ memory-static-max  
• Dynamic Minimum ≥ 1⁄4 Static Maximum for all supported operating systems

Following are the settings made during the CS API calls.

DeployVmCmd - 

During the initial deployment of the VM we set memory variable as follows :-

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• There is also an option of having a custom compute offering where user can specify values for CPU and RAM during deployment or scaling up. But am not sure if this option can be misused since this is a user level API. Another complexity is to capture usage. Currently it is done based on compute offering.
• Scaling flag should be put in service offering to enable/disable scaling