There used to be a FedEx commercial that had a saying “when it just has to be there overnight”. What if we did a play on words and changed the saying to work with Fault-Tolerance and or High Availability. The saying would be something like “when it just has to remain running overnight”.
Every business environment today demands both performance and ultra-high availability. When working with virtual environments some high availability options are included already with the ability to restart any virtual machines that were running on a host that failed and crashed. This still has limitations in that the virtual machine would still need to be restarted and this in itself still has some downtime. The amount of downtime can vary depending on variables with things like the number of virtual machines to be restarted and the number of hosts available to handle the virtual machines restarting. Downtime could be as quick as five minutes or as long as thirty minutes depending on the variables.