This LPIC-1 practice question tests your understanding of system architecture. 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 system administrator is troubleshooting a Linux server that fails to boot. The server has a software RAID 1 configuration using mdadm, with the root filesystem located on /dev/md0. During boot, the system halts with the following error: 'VFS: Unable to mount root fs on unknown-block(0,0)'. The admin verifies that the BIOS recognizes all disks and that the RAID array was properly assembled prior to the last shutdown. The system was working after a recent kernel update, but now fails. Which of the following actions is the most likely solution?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rebuild the initramfs to include the mdadm module and the RAID metadata.
Option D is correct because the error indicates the kernel cannot find the root filesystem device. After a kernel update, the initramfs may not contain the necessary mdadm modules and RAID metadata support. Rebuilding the initramfs with mdadm support (e.g., using mkinitramfs or dracut) includes the required modules and fixes the boot issue. Option A is incorrect because the bootloader already loads the kernel; the problem occurs after that. Option B is incorrect because /etc/fstab is read after the root filesystem is mounted. Option C is incorrect because /dev/md0 is not available at the point of the error, so fsck cannot be run.
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.
✗
Use a live CD to run fsck on /dev/md0.
Why it's wrong here
The device /dev/md0 may not be available in the initramfs; fsck cannot be run on an unmountable device.
✓
Rebuild the initramfs to include the mdadm module and the RAID metadata.
Why this is correct
Rebuilding the initramfs adds the necessary RAID support, allowing the kernel to assemble and mount /dev/md0.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Check the /etc/fstab file for incorrect root device.
Why it's wrong here
/etc/fstab is only read after the root filesystem is mounted; the error occurs before that.
✗
Reinstall the bootloader on the MBR.
Why it's wrong here
The bootloader is functioning as it loads the kernel; reinstalling it does not address the missing root device.
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.
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 LPIC-1 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.
What to study next
Got this wrong? Here's your next step.
Identify which LPIC-1 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.
System Architecture — This question tests System Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rebuild the initramfs to include the mdadm module and the RAID metadata. — Option D is correct because the error indicates the kernel cannot find the root filesystem device. After a kernel update, the initramfs may not contain the necessary mdadm modules and RAID metadata support. Rebuilding the initramfs with mdadm support (e.g., using mkinitramfs or dracut) includes the required modules and fixes the boot issue. Option A is incorrect because the bootloader already loads the kernel; the problem occurs after that. Option B is incorrect because /etc/fstab is read after the root filesystem is mounted. Option C is incorrect because /dev/md0 is not available at the point of the error, so fsck cannot be run.
What should I do if I get this LPIC-1 question wrong?
Identify which LPIC-1 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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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