Discuss romana's answer to: What is server redundancy?

In terms of fault tolerance, server redundancy refers to the practice of having a secondary computer system or network device that will take over when the primary server fails. Systems that use server redundancy are able to reduce or eliminate any network downtime.

Using a process known as server failover, when a failure or interruption is detected, the operations of the primary server will be transferred to the secondary device. This transition can be designed to happen transparently and without the need for any human interaction.