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For dynamic scaling to work virtual machine should have XS tools / VMware tools installed on it. To ensure this Admin/User should provide an input whether tools are installed on the template(during registering the template or can be done using update template API) that is used to deploy vm. If the user deploys a virtual machine with a template that does not have XS tools / VMware tools and later if tools are installed on the VM then this can informed to Cloudstack by updating the virtual machine (using updatevirtualmachine API). After installation of tools and updating the virtual machine, user needs to stop and start the vm from cloudstack in order to work dynamic scaling of CPU and RAM for that VM. The reason why we need to stop start the VM after updating is we need to set static max memory to some higher value before VM starts so that we can dynamically scale the VM upto static max.

Web Services APIs

Following APIs needs to be changed:

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