平成30年度春期 ITパスポート試験問94

This question's explanation and your answers so far.

問94

頻出度★★☆

サーバに2台の HDD を接続しているとき, HDD の故障がどちらか片方だけであれば運用が続けられるようにしたい。使用する構成として, 適切なものはどれか。

出典　平成30年度春期 ITパスポート試験問94

解説

問 94

Incorrectア
Striping (RAID0) is a method that splits one set of data across two HDDs to speed up reading and writing. Because it keeps no copy of the same data, if one HDD breaks, all data is lost and operation cannot continue. Its purpose is to improve speed; it has no fault tolerance.
Incorrectイ
Data mining is a technique for analyzing and discovering patterns or useful insights from large amounts of data; it has nothing to do with HDD redundancy configuration. It is an entirely different matter from keeping operation running when a failure occurs.
Incorrectウ
Tethering is a function that connects a PC to the Internet via a mobile line such as a smartphone. It is a means of sharing a network connection and has nothing to do with countermeasures for HDD failure.
エ
正解 The correct answer is エ, mirroring. Mirroring is also called RAID1 and is a method that always writes exactly the same data to two HDDs in duplicate. Even if one HDD fails, the other still holds the identical data as-is, so the system can keep running without being stopped. This exactly matches the fault-tolerance requirement in the question: to keep running even if either one of the two HDDs breaks.

ここがポイント

Mirroring (RAID1) writes identical data to two HDDs in duplicate, so operation can continue even if one fails; it is a configuration for fault tolerance.
Striping (RAID0) raises speed through distributed writing but has no redundancy and cannot be used for fault tolerance; do not confuse the two.

用語

解答問94エ