What does "charging" for idle memory in Idle Memory Tax indicate in vSphere 6?

In the context of vSphere 6, "charging" for idle memory in Idle Memory Tax serves to penalize virtual machines (VMs) that do not utilize the memory resources allocated to them. This mechanism is designed to promote more efficient use of memory by discouraging VMs from reserving resources that they are not actively using.

When a VM is allocated memory but is largely idle, the Idle Memory Tax policy encourages the hypervisor to reclaim that unused memory. By doing this, vSphere can allocate the freed-up memory to other active VMs that require additional resources, thereby optimizing overall system performance. This approach helps ensure that physical memory is being utilized effectively and reduces the potential for resource wastage in the environment.

While the other options may hint at various operational aspects of vSphere, they do not capture the primary intent and function of charging for idle memory. The focus is on the efficiency of resource allocation and usage among VMs, creating a more dynamic and responsive virtualization environment.