City Guilds Model Questions Vol1 2025 Information Technology Question 48

Practice objective / multiple choice question 48 from the 2025 City Guilds Model Questions Vol1 Information Technology examination.

City Guilds Model Questions Vol1 2025 Information Technology Objective / Multiple Choice Hard Difficulty
Question 48 CITY_GUILDS_MODEL_QUESTIONS_VOL1 • 2025 • INFORMATION_TECHNOLOGY • objective

A small business plans to store 30 TB of data using identical 8 TB drives. Two RAID options are considered:\n\n• RAID 5 with 6 drives.\n• RAID 6 with 8 drives.\n\nEach drive has an annual failure probability of 0.02, failures are independent, and the system fails if more drives fail than the RAID level can tolerate. Determine for each option (i) the usable storage capacity, (ii) the annual probability of system failure, and (iii) which RAID configuration satisfies a required availability of at least 99.9 % (i.e., failure probability ≤ 0.001).

Answer Options

A. RAID 5: 40 TB, failure ≈ 0.0012; RAID 6: 48 TB, failure ≈ 0.00041; choose RAID 5
B. RAID 5: 40 TB, failure ≈ 0.0057; RAID 6: 48 TB, failure ≈ 0.0025; choose RAID 5
C. RAID 5: 32 TB, failure ≈ 0.0057; RAID 6: 48 TB, failure ≈ 0.00041; choose RAID 6
Correct Answer D. RAID 5: 40 TB, failure ≈ 0.0057; RAID 6: 48 TB, failure ≈ 0.00041; choose RAID 6
Correct Answer
D
Correct Option:
RAID 5: 40 TB, failure ≈ 0.0057; RAID 6: 48 TB, failure ≈ 0.00041; choose RAID 6

About This Question

This is City Guilds Model Questions Vol1 2025 Information Technology Question 48. It is one of the objective questions from the 2025 City Guilds Model Questions Vol1 Information Technology examination.

Difficulty level: Hard .

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