- A
Performance degrades but data remains intact
Why wrong: Performance degrades with one failure, but second failure leads to data loss.
- B
Data is still available from parity
Why wrong: RAID 5 can only survive one failure; second failure causes data loss.
- C
The system automatically switches to a hot spare
Why wrong: If a hot spare existed, it would have been used; the scenario implies no spare.
- D
Data loss occurs
With two failed disks, RAID 5 cannot reconstruct data.
Question 326 of 984
CISA Practice Question: Information Systems Operations and Business Resilience
This CISA practice question tests your understanding of information systems operations and business resilience. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses a RAID 5 array for its file server. One disk fails, and the system continues to operate. However, during the rebuild process, a second disk fails. What is the likely consequence?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Data loss occurs
RAID 5 can tolerate a single disk failure. If a second disk fails during rebuild, the array is broken and data loss occurs.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Performance degrades but data remains intact
Why it's wrong here
Performance degrades with one failure, but second failure leads to data loss.
- ✗
Data is still available from parity
Why it's wrong here
RAID 5 can only survive one failure; second failure causes data loss.
- ✗
The system automatically switches to a hot spare
Why it's wrong here
If a hot spare existed, it would have been used; the scenario implies no spare.
- ✓
Data loss occurs
Why this is correct
With two failed disks, RAID 5 cannot reconstruct data.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Scenario analysis trap
If a hot spare existed, it would have been used; the scenario implies no spare.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CISA exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Quick reference
RAID Level Comparison
| RAID Level | Min Disks | Fault Tolerance | Read | Write | Usable Capacity |
|---|---|---|---|---|---|
| RAID 0 | 2 | None | Excellent | Excellent | 100% |
| RAID 1 | 2 | 1 disk | Good | Moderate | 50% |
| RAID 5 | 3 | 1 disk | Good | Moderate | 67–94% |
| RAID 6 | 4 | 2 disks | Good | Lower | 50–88% |
| RAID 10 | 4 | 1 disk per mirror | Excellent | Good | 50% |
RAID is not a backup strategy — it protects against disk failure but not against accidental deletion, ransomware, or site-level events.
What to study next
Got this wrong? Here's your next step.
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this CISA question test?
Information Systems Operations and Business Resilience — This question tests Information Systems Operations and Business Resilience — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Data loss occurs — RAID 5 can tolerate a single disk failure. If a second disk fails during rebuild, the array is broken and data loss occurs.
What should I do if I get this CISA question wrong?
Identify which CISA exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This CISA practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISA exam.
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