- A
The /etc/fstab entry for the new disk is missing.
Why wrong: Missing fstab entry for the new disk does not affect boot since root is on LVM.
- B
The GRUB configuration is incorrect.
Why wrong: GRUB configuration is not automatically changed by adding a disk.
- C
The new disk's partition table is corrupt.
Why wrong: A corrupt partition table on a new disk does not prevent root filesystem mount.
- D
The initramfs was not regenerated after the disk addition, missing LVM tools.
Correct: initramfs needs to include LVM support; adding disk may change device order and require initramfs rebuild.
Question 35 of 513
LFCS Storage Management Practice Question
This LFCS practice question tests your understanding of storage management. 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.
After adding a new SCSI disk to a server running Linux, the system fails to boot with the error: 'Kernel panic - not syncing: VFS: Unable to mount root fs'. The root filesystem is on LVM. What is the most likely cause?
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 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
✓
The initramfs was not regenerated after the disk addition, missing LVM tools.
When the root filesystem resides on LVM, the initramfs must contain the LVM tools and modules (e.g., lvm2, device-mapper) to activate the logical volumes before the kernel can mount the root filesystem. Adding a new SCSI disk does not inherently require regenerating the initramfs, but if the initramfs was not rebuilt after the LVM configuration changed (e.g., after adding a disk that becomes part of a volume group), it may lack the necessary LVM support, causing a kernel panic when it cannot mount the root LV.
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.
- ✗
The /etc/fstab entry for the new disk is missing.
Why it's wrong here
Missing fstab entry for the new disk does not affect boot since root is on LVM.
- ✗
The GRUB configuration is incorrect.
Why it's wrong here
GRUB configuration is not automatically changed by adding a disk.
- ✗
The new disk's partition table is corrupt.
Why it's wrong here
A corrupt partition table on a new disk does not prevent root filesystem mount.
- ✓
The initramfs was not regenerated after the disk addition, missing LVM tools.
Why this is correct
Correct: initramfs needs to include LVM support; adding disk may change device order and require initramfs rebuild.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume adding a disk only requires updating /etc/fstab or GRUB, but the LFCS exam specifically tests the dependency of LVM-based root filesystems on a properly generated initramfs containing LVM tools.
Detailed technical explanation
How to think about this question
The initramfs (initial RAM filesystem) is a temporary rootfs loaded into memory by the bootloader; it contains kernel modules and user-space tools (like lvm) needed to mount the real root filesystem. If the initramfs is not regenerated after LVM metadata changes (e.g., adding a PV to a VG that contains the root LV), the lvm2 tools inside it may not recognize the updated volume group structure, leading to a 'VFS: Unable to mount root fs' panic. In practice, running `update-initramfs -u` (Debian/Ubuntu) or `dracut --force` (RHEL/CentOS) rebuilds the initramfs to include current LVM state.
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.
TExam Day Tips
- 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 LFCS 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.
Visual reference
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Storage Management — study guide chapter
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FAQ
Questions learners often ask
What does this LFCS question test?
Storage Management — This question tests Storage Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The initramfs was not regenerated after the disk addition, missing LVM tools. — When the root filesystem resides on LVM, the initramfs must contain the LVM tools and modules (e.g., lvm2, device-mapper) to activate the logical volumes before the kernel can mount the root filesystem. Adding a new SCSI disk does not inherently require regenerating the initramfs, but if the initramfs was not rebuilt after the LVM configuration changed (e.g., after adding a disk that becomes part of a volume group), it may lack the necessary LVM support, causing a kernel panic when it cannot mount the root LV.
What should I do if I get this LFCS question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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Last reviewed: Jul 4, 2026
This LFCS practice question is part of Courseiva's free Linux Foundation 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 LFCS exam.
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