SK0-005 troubleshooting Practice Question
A RAID 5 array is degraded due to a failed disk. What is the best practice for recovery?
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
✓
Replace the failed disk and allow the array to rebuild automatically
Option C is correct because replacing the failed disk and allowing automatic rebuild utilizes the array's redundancy and minimizes downtime. Option A destroys the existing configuration. Option B and D are unnecessary if the array can rebuild.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Replace the failed disk and restore from backup
Why it's wrong here
Restoring from backup is time-consuming and should only be done if the rebuild fails; not the best practice.
- ✓
Replace the failed disk and allow the array to rebuild automatically
Why this is correct
RAID 5 can rebuild using parity; replacing the disk triggers automatic rebuild, preserving data and uptime.
- ✗
Replace the failed disk and perform a manual rebuild from backup
Why it's wrong here
Manual rebuild from backup is slower and riskier than automatic rebuild, and should only be done if automatic fails.
- ✗
Delete the logical drive and recreate the array
Why it's wrong here
This would cause data loss and is not necessary when a simple disk replacement can restore the array.
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.
Go deeper
Related to this question
Learn chapter
Disaster Recovery and Business Continuity Planning
Key term
RAID Levels
RAID (Redundant Array of Independent Disks) levels are different configurations that combine multiple hard drives or SSDs to improve performance, reliability, or both.
Key term
RAID 5
RAID 5 is a disk array configuration that uses block-level striping with distributed parity to provide fault tolerance and good read performance while using storage space efficiently.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed July 2026 · checked against the official CompTIA exam blueprint
This SK0-005 practice question is part of Courseiva's free CompTIA 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 SK0-005 exam.