A redundancy scheme in which two systems perform the same processing at the same time and operate while comparing the results. Errors can be noticed from disagreements in the results, and if one system fails the other continues processing as is. Reliability is high, but the cost is large because two sets of equipment do the same work.
Japanese name: デュアルシステム
Dual system appears in 2 practice questions across 1 topic, including System Architecture and Reliability.
Answer: C. Two systems perform the same processing at the same time and compare the results, and if one fails, the other continues processing
A dual system runs the same processing on two systems at the same time and compares the results as it operates. If the results disagree, an error can be noticed, and if one system fails the other can continue processing as is, so it is used for processing that requires high reliability. In exchange, the cost is high because two sets of equipment do the same work. Dividing into a primary and a standby and switching over on failure is a duplex system.
A dual system runs the same processing on two systems at the same time and compares the results as it operates.
Which describes a dual system?Performing and comparing the same processing on two systems at the same time is a dual system.
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Duplex system Hot standby Differential backup Fail-safe Fail-soft Fault tolerance Fool-proof Incremental backup Load balancer RAID