ITPEC IP October 2023 Question 11
Which of the following is a method of writing the same data to multiple hard disks simultaneously and improving reliability rather than performance?
Explanation
Mirroring — writing the same data to two or more disks at once keeps it available if one disk fails.
Mirroring (RAID 1) writes every piece of data to each disk of the set, so every disk holds a complete copy. When one fails, processing continues on the other and no data is lost. The price is capacity: two disks give the usable space of one. Its aim is reliability, not speed.
Answer (d)
Why not others:
- •(a) Striping — (RAID 0) splits data into blocks spread across several disks so they are read and written in parallel; it improves performance, keeps no copy, and loses data if any disk fails
- •(b) Paging — virtual memory management that moves fixed-size pages between main memory and auxiliary storage; not a way of writing to several disks
- •(c) Interleaving — spreads consecutive addresses across memory banks so accesses overlap; it speeds up access and adds no redundancy
Key rule: Mirroring duplicates data for reliability; striping distributes different data across disks for speed. RAID 5 combines striping with parity to get some of both.
System Component · AI-written, may contain errors
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