Enable vSphere HA and DRS for VMware vSphere
[VSOM video series: http://bit.ly/15BqQUp]
This video shows how to use the VMware vSphere web client to enable and configure High Availability (HA) and Dynamic Resource Scheduling (DRS). HA protects against machines down time by automating recovery in the event of a host failure. DRS ensures performance by balancing virtual machine workloads across hosts a cluster.
Source: Enable vSphere HA and DRS for VMware vSphere (Youtube).