What does vSphere HA (High Availability) allow you to do?

vSphere HA (High Availability) is a feature that provides a level of fault tolerance for virtualized environments. Specifically, it enables the automatic restart of virtual machines on other available hosts in a cluster if the original host fails. This ensures minimal disruption to services and applications running within those virtual machines, improving uptime and reliability.

When a host in a cluster encounters a failure, vSphere HA continuously monitors the state of the virtual machines and, in the event of failure, leverages the resources of the remaining hosts to quickly restart those virtual machines. This process minimizes downtime, allowing businesses to maintain operations even during hardware or host malfunctions.

The other options do not accurately represent the primary function of vSphere HA. Balancing network traffic pertains to load balancing solutions rather than HA. Optimizing storage space involves storage management and not high availability. Automating application installation is a feature associated with orchestration or configuration management tools, not specifically with vSphere HA. Thus, the emphasis on failover capabilities in the context of host failures solidifies the understanding of vSphere HA's critical role in ensuring high availability for virtualized workloads.