問45
頻出度★☆☆
事業継続計画 (BCP) における情報システムに関するファシリティマネジメントの施策のうち, 大地震によってデータセンタが長期間停止することを想定した施策はどれか。
平成25年度 春期 ITパスポート試験 問45
マネジメント系サービスマネジメント › ファシリティマネジメント
This question's explanation and your answers so far.
解説
問 45
Incorrectア
Placing servers on a high floor protects them from being flooded by a tsunami or a flood; it is a preventive measure that protects the equipment before damage occurs. However, the servers still sit inside the damaged data center, so if the building, the power, or the communication lines become unusable for a long time, the system stops as well. It is not a preparation for the long-term outage itself.
Incorrectイ
A UPS (uninterruptible power supply) is a device that supplies power temporarily for a few minutes to a few tens of minutes from the moment of a power failure. Its purpose is to bridge the gap until a safe shutdown or a switch to in-house generation, and it has no ability to ride out a long-term outage. It is a countermeasure for brief power dips and outages, and it cannot cover the assumption of a long-term outage caused by a major earthquake.
Incorrectウ
Duplicating various facilities such as power supplies and lines is redundancy that lets operation continue even when a single device or a single route fails. However, both of the duplicated facilities are inside the same data center, so if the whole building is damaged, the spare side is lost at the same time. It is effective against a single point of failure, but it cannot save the situation where the entire site stops for a long period.
- エ
正解 The correct answer is エ. What this question narrows down to is the assumption that a major earthquake stops the data center for a long period, and no matter how much the equipment inside that site is strengthened, the business stays stopped. Choice エ, setting up a backup center at a remote location that periodically synchronizes data, prepares a second site outside the area damaged by the earthquake. Placing it far away avoids having both sites hit by the same earthquake at once, and synchronizing data regularly in normal times means that, when the disaster occurs, processing can be taken over on the backup center side using data that is close to the latest. In other words, business can continue even if the main site is not restored for a long time, so it is correct as a preparation for the long-term outage assumed by a BCP (business continuity plan).
ここがポイント
- BCP (business continuity plan) measures are chosen according to the assumed scope of damage and the length of the outage. Redundancy, a UPS, and earthquake- or flood-proofing within the same site are short-term, local measures that assume the site survives; when the assumption is that the site itself becomes unusable for a long time, an alternate site at a remote location (a backup center) is required.
- The reason for placing the backup center at a remote location is to avoid having the main site and the alternate site damaged at the same time by the same disaster. In addition, performing regular data synchronization reduces the data loss at switchover, which makes it easier to meet the recovery targets RTO (recovery time objective) and RPO (recovery point objective).
用語