You’re concerned a physical host outage will impact running VMs in your cloud environment.
Which of the following vSphere features will help recover from a failed ESXi host?

A.
vSphere High Availability

B.
vMotion

C.
Storage vMotion

D.
Distributed Resource Scheduler

Explanation:
http://pubs.vmware.com/vsphere-51/topic/com.vmware.ICbase/PDF/vsphere-esxivcenter-server-51-availability-guide.pdf(page 9, see drs and vmotion integration, last sentence)