Final answer:
The switching of applications and data resources to an alternative system following a failure is known as failover, which ensures high-availability and continuity. Option D is correct.
Step-by-step explanation:
The function of switching an application and data resources over from a failed system to an alternative system in the cluster is referred to as failover. This process is critical for high-availability systems and is designed to minimize downtime and maintain service continuity.
When a failure is detected in one part of the system, the failover mechanism redirects the workload to the standby system, which takes over the operation with as little disruption as possible. After the original system is repaired and ready for service again, a failback may occur, which is the process of returning the operations to the primary system.
The function of switching an application and data resources over from a failed system to an alternative system in the cluster is referred to as failover.
Failover is an important concept in computer clusters. It ensures high availability and continuous operation of systems by automatically transferring workload from a failed system to a healthy system in the cluster.
For example, in a web server cluster, if one server fails, the failover mechanism automatically redirects incoming requests to another server in the cluster, minimizing downtime and ensuring that the service remains uninterrupted.