Currently, CloudStack allows admins to configure the dynamic scaling of CPU and RAM for the VMs using a global or zone level setting “enable.dynamic.scale.vm” and through a “Dynamically Scalable” flag in templates. However, the global or zone setting applies to all VMs in a particular region or zone and there may be virtual hardware or software limitations on a VM meaning that dynamic scaling would not be applicable (e.g. OS virtual hardware support, OS licensing, application licensing, hypervisor fault tolerance, etc).

In order to let the user or admin decide whether to disable dynamic scaling of VM at a more granular level, this feature provides options to disable dynamic scaling at service offering and at VM levels. If the dynamic scaling flag is disabled either at service offering or at VM, then that VM cannot be scaled dynamically.

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CloudStack Feature First Look Series is a series where we explore new capabilities of Apache CloudStack and show how to benefit from them in practice. It was developed by the ShapeBlue team, and we’re open to receiving questions and suggestions.
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