Question 114 of 144
SK0-005 server-administration Practice Question
A technician is installing a new server for a department. The server will run a single application that requires high reliability. The operating system should be protected against a single disk failure without sacrificing read performance. Which RAID configuration is MOST appropriate?
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
✓
RAID 1
Option D is correct because RAID 1 mirrors the OS drive, providing fault tolerance and good read performance. Option A (RAID 0) has no redundancy. Option B (RAID 5) requires at least three disks and has write penalty. Option C (RAID 6) requires at least four disks and is overkill for a simple OS mirror.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
RAID 5
Why it's wrong here
RAID 5 uses parity and requires at least three disks; it is often used for data volumes, but has write performance overhead.
- ✗
RAID 6
Why it's wrong here
RAID 6 uses double parity and requires at least four disks; it is overkill for an OS drive and reduces write performance.
- ✓
RAID 1
Why this is correct
RAID 1 mirrors data across two disks, providing fault tolerance and excellent read performance for the OS.
- ✗
RAID 0
Why it's wrong here
RAID 0 stripes data with no redundancy, so a single disk failure causes data loss.
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.
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Last reviewed: Jul 26, 2026
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.
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