Which term refers to having duplicate components to keep systems operating during a failure?

Which term refers to having duplicate components to keep systems operating during a failure?

• A. High Availability
• B. Failover
• C. Availability
• D. Redundancy

Answer: (D)

Having duplicate components to keep systems operating during a failure is redundancy. Redundancy means you provision extra, parallel components so that if one part fails, another can take over without interrupting service. This is what keeps systems running even under hardware or software faults. The switch to the backup component when a failure is detected is the failover process, which is the mechanism that makes redundancy effective. High availability describes the overall goal of keeping services up with minimal downtime, typically achieved through redundancy plus failover. Availability is the measurable uptime of a system, which redundancy helps improve by reducing the impact of failures. Common examples include redundant power supplies, RAID disk arrays, and paired servers in a cluster.

Having duplicate components to keep systems operating during a failure is redundancy. Redundancy means you provision extra, parallel components so that if one part fails, another can take over without interrupting service. This is what keeps systems running even under hardware or software faults. The switch to the backup component when a failure is detected is the failover process, which is the mechanism that makes redundancy effective. High availability describes the overall goal of keeping services up with minimal downtime, typically achieved through redundancy plus failover. Availability is the measurable uptime of a system, which redundancy helps improve by reducing the impact of failures. Common examples include redundant power supplies, RAID disk arrays, and paired servers in a cluster.