Configuring vSphere HA Admission Control
As with any environment, not all workloads are the same and we will need to be selective about the virtual machines that need to be restarted, and more importantly the sequence of restart. Admission control configuration plays a key role in ensuring that the right virtual machines are restarted in a specific order and ensuring that it does not do so at the cost of performance degradation of the other running VMs.
There are three admission control policies:
- Cluster resource percentage
- Slot Capacity
- Specify dedicated failover hosts
In this recipe, we will discuss configuring admission control and its nuances.
Getting ready
Needless to say; ensure vSphere HA is configured. At a high level, have a categorization of workloads based on their criticality. In addition, remember that failover capacity is a key attribute in your original design, that is, how much headroom you have in your cluster in the event of failure in terms of capacity or the number of hosts...
