If you have had the pleasure of losing a datastore on you vSphere host, you know all too well that the virtual machine can become orphaned and unusable until the datastore is back online. VM Component Protection (VMCP) can help eliminate that issue if there is another host in the cluster that has access to the datastore. When a datastore accessibility failure occurs, the affected host can no longer access the storage path for a specific datastore. You can determine the response that vSphere HA will make to such a failure, ranging from the creation of events to virtual machine restarts on other hosts.
To enable VMCP, you check off Protect against Storage Connectivity Loss.