[ TIP OF THE DAY ] Why do you need a vCenter Server cluster and not separated ESXi hosts.

Why do you need a vCenter Server cluster and not just separated ESXi hosts to monitoring and manage VMs? Did you know that through the vCenter Server, you can monitor the health and status of all connected ESXi hosts. ESXi hosts managed by a single vCenter Server can be grouped into clusters. The VMs running on hosts in the same cluster share resources between them, including CPU, memory, storage, and network bandwidth.

The following image shows one cluster of a data center. The cluster is made up of three ESXi hosts, each hosting two virtual machines (including the vCenter Server) running their own applications and guest operating systems. Once created, a vSphere cluster enables “cluster only” features such as HA (high availability) and DRS (distributed resource scheduler). Each of these features helps to the tolerance of the VMware cluster failures as well as distributing resources across the VMware ESXi hosts.