What does the Admission Control setting "allows VMs to be powered on" in HA cluster configuration imply?

In the context of a High Availability (HA) cluster configuration in VMware vSphere, the setting that "allows VMs to be powered on" indicates that overcommitment of resources is permitted. This especially refers to scenarios where the total demand for resources from virtual machines (VMs) exceeds the actual physical resources available on the hosts within the cluster.

When the Admission Control setting is configured to allow VMs to be powered on, it removes restrictions that would normally prevent a VM from being started if there is insufficient capacity. This setting can be beneficial in environments where resource usage fluctuates, as it allows for better flexibility in resource allocation. It enables administrators to power on additional VMs even when the total demand exceeds the available resources, anticipating that not all VMs will be running at peak capacity simultaneously.

This capability is particularly useful in test or development environments or workloads that are not critical, where it is acceptable to take risks regarding resource availability. However, it comes with the trade-off that if there is a failure of a host, the HA cluster may not have enough resources to restart all VMs on the surviving hosts, potentially resulting in downtime for some VMs.

Overall, this setting reflects a strategy to maximize the use of available resources by allowing more