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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 database server experiences performance degradation. Analysis shows high I/O wait on a LVM logical volume that uses striping across two physical volumes. What is the most effective way to improve performance?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a cache layer using lvmcache on a fast SSD
Adding a cache layer using lvmcache on a fast SSD is the most effective way to reduce high I/O wait because it places frequently accessed (hot) data on the faster SSD while keeping the bulk of data on the slower striped HDDs. This directly addresses the I/O bottleneck without requiring data migration or downtime, and it leverages the existing striped layout for sequential throughput while improving latency for random reads/writes.
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.
✓
Add a cache layer using lvmcache on a fast SSD
Why this is correct
Caching with SSDs accelerates reads and writes, reducing I/O wait.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the stripe size and recreate the LV
Why it's wrong here
Increasing stripe size might help for large sequential I/O but requires recreation and does not solve the root issue of slow disks.
✗
Add an additional PV to the VG and extend the LV
Why it's wrong here
Adding more PVs may distribute load but does not address high I/O wait due to slow disks.
✗
Convert the LV to use linear mapping instead of striping
Why it's wrong here
Striping improves parallelism; converting to linear would worsen performance.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume striping alone maximizes performance, but they overlook that high I/O wait is often due to random access latency, which a cache layer directly mitigates without requiring a disruptive reconfiguration.
Detailed technical explanation
How to think about this question
lvmcache uses the dm-cache kernel module to create a two-tier logical volume: a fast cache pool (SSD) and a slow origin volume (striped HDDs). The cache policy (e.g., multiqueue or smq) determines which blocks are promoted to the cache based on access frequency, and writeback or writethrough modes control write behavior. In a real-world scenario, a database with high random I/O (e.g., OLTP) benefits most from caching, while a sequential workload (e.g., data warehouse) might see less improvement.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Add a cache layer using lvmcache on a fast SSD — Adding a cache layer using lvmcache on a fast SSD is the most effective way to reduce high I/O wait because it places frequently accessed (hot) data on the faster SSD while keeping the bulk of data on the slower striped HDDs. This directly addresses the I/O bottleneck without requiring data migration or downtime, and it leverages the existing striped layout for sequential throughput while improving latency for random reads/writes.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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