Availability has traditionally been one of the most important aspects when providing services. When providing services on a shared platform like VMware vSphere, the impact of downtime exponentially grows as many services run on a single physical machine. As such VMware engineered a feature called VMware vSphere High Availability (HA). VMware vSphere High Availability, hereafter simply referred to as HA, provides a simple and cost effective solution to increase availability for any application running in a Virtual Machine (VM) regardless of its operating system. It is configured using a couple of simple steps through vCenter Server (vCenter) and as such provides a uniform and simple interface. HA enables you to create a cluster out of multiple ESXi hosts.
This will allow you to protect VMs and their workloads. In the event of a failure of one of the hosts in the cluster, impacted VMs are automatically restarted on other ESXi hosts within that same VMware vSphere Cluster.
