LPIC-2 Practice Question: Block Devices, Filesystems and Advanced Storage
This LPIC-2 practice question tests your understanding of block devices, filesystems and advanced storage. 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 server running Linux with an ext4 filesystem on /dev/sda1 has experienced an unexpected power loss due to a faulty power supply. After replacing the power supply and rebooting, the system fails to mount /dev/sda1 with an error message indicating 'wrong superblock magic number' or 'superblock corrupted'. The administrator recalls that ext4 filesystems have backup superblocks created during mkfs. Using the command 'dumpe2fs /dev/sda1 | grep -i backup' is not possible because the device is not mountable. However, the administrator remembers that for this specific filesystem, a backup superblock is located at block offset 32768 based on the output of 'mke2fs -n' from the original creation. What is the correct course of action to recover the filesystem and mount it?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run `fsck.ext4 -b 32768 /dev/sda1` to restore the superblock, then mount the filesystem.
Option A is correct because fsck.ext4 with the -b option specifies the backup superblock location, allowing the filesystem to be repaired and mounted. Option B destroys the superblock and data. Option C adds a journal but does not recover the superblock. Option D attempts to use the default superblock, which is corrupted, and will likely fail.
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.
✓
Run `fsck.ext4 -b 32768 /dev/sda1` to restore the superblock, then mount the filesystem.
Why this is correct
This uses the backup superblock at block 32768 to repair the filesystem, allowing it to mount.
Related concept
Read the scenario before looking for a memorised answer.
✗
Run `e2fsck -fy /dev/sda1` to force a filesystem check.
Why it's wrong here
e2fsck will use the default superblock, which is corrupted, so it will fail to perform a meaningful check.
✗
Run `dd if=/dev/zero of=/dev/sda1 bs=4k count=1` to zero the superblock, then create a new filesystem with mkfs.ext4.
Why it's wrong here
This destroys all data on the partition; it is not a recovery method.
✗
Run `tune2fs -j /dev/sda1` to add a journal to the filesystem.
Why it's wrong here
The filesystem already has a journal; this command does not fix a corrupted superblock.
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
Command / output trap
The filesystem already has a journal; this command does not fix a corrupted superblock.
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-2 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-2 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.
Block Devices, Filesystems and Advanced Storage — This question tests Block Devices, Filesystems and Advanced Storage — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Run `fsck.ext4 -b 32768 /dev/sda1` to restore the superblock, then mount the filesystem. — Option A is correct because fsck.ext4 with the -b option specifies the backup superblock location, allowing the filesystem to be repaired and mounted. Option B destroys the superblock and data. Option C adds a journal but does not recover the superblock. Option D attempts to use the default superblock, which is corrupted, and will likely fail.
What should I do if I get this LPIC-2 question wrong?
Identify which LPIC-2 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.
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Question Discussion
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