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Following APIs needs to be changed:

scaleVirtualMachine - This There is an existing API upgradeVirtualMachine and takes vm_id and compute_offering_id as inputs. This is a sync call currently and will not be used anymore since we need it to be async. I plan to deprecate this api in the next big release (5.0).
With this feature I will introduce another API named scaleVirtualMachine which will be similar to upgradeVirtualMachine in every aspect except that it would be async.
For system VMs the same API can be used but proper access checks would be done. In addition it will be callable when the vm is in running state as well to dynamically scale the vm.
In case of a migration this will internally use the migrateVirtualMachine API logic.

scaleSystemVm -  There is an existing API upgradeSystemvm and takes system vm_id and compute_offering_id as inputs. This is a sync call currently and will not be used anymore since we need it to be async. I plan to deprecate this api in the next big release (5.0).
With this feature I will introduce another API named scaleSystem vm which will be similar to upgradeSystemvm in every aspect except that it would be async. In addition it will be callable when the system vm is in running state as well to dynamically scale the vm.

Hypervisor Changes

Xenserver

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