The answer is to configure the application to write logs to Cloud Logging using the Logging agent. This is correct because the Logging agent streams log data from the VM to Cloud Logging in near real-time, decoupling log storage from the VM’s lifecycle and local persistent disk. If the VM fails, the logs are already safely stored in a centralized, durable, managed service, preventing log loss on Compute Engine VM failure. On the Google Professional Cloud Architect exam, this scenario tests your understanding of architecting for resilience and observability—specifically that ephemeral VM resources like local disks are not reliable for critical log data. A common trap is choosing to replicate the persistent disk or use snapshots, but those still tie log durability to the VM’s storage lifecycle. Memory tip: think “stream, don’t store”—logs should flow off the instance before the instance can fail.
Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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 company is running a critical application on Compute Engine. The application writes logs to a local persistent disk. The operations team wants to ensure logs are not lost if the VM fails. What should they do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the application to write logs to Cloud Logging using the Logging agent.
Option D is correct because Cloud Logging with the Logging agent provides a centralized, durable, and managed log storage solution. The agent streams logs from the VM to Cloud Logging in near real-time, ensuring logs are preserved even if the VM or its local persistent disk fails. This decouples log storage from the VM's lifecycle, meeting the operations team's requirement for log durability.
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 regional persistent disk to replicate data across zones.
Why it's wrong here
Regional disk protects against zone failure but not VM failure; logs are still on disk but not streamed off-instance.
✗
Schedule persistent disk snapshots every 5 minutes.
Why it's wrong here
Snapshots are not real-time and may miss logs generated between snapshots.
✗
Create a script to copy logs to a Cloud Storage bucket every minute.
Why it's wrong here
This is a manual workaround but not as reliable as a managed agent; also, if VM fails, the script stops.
✓
Configure the application to write logs to Cloud Logging using the Logging agent.
Why this is correct
Logs are streamed to a durable, centralized service, ensuring no loss on VM failure.
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 often overestimate the reliability of local persistent disks or periodic backups (snapshots/scripts) for log durability, failing to recognize that only a real-time, off-instance streaming solution like Cloud Logging eliminates the risk of log loss during VM failure.
Detailed technical explanation
How to think about this question
The Logging agent (fluentd-based) uses a buffered, reliable transport protocol (gRPC or HTTP) to send logs to Cloud Logging's API, which stores them in a highly durable, replicated backend (typically using Colossus, Google's distributed file system). This approach achieves near-real-time log ingestion with minimal latency, typically under 10 seconds, and supports automatic retries on transient failures. In a real-world scenario, a VM crash during a high-traffic event would lose all logs not yet flushed by a periodic script or snapshot, whereas the Logging agent's continuous streaming ensures logs are safely stored in Cloud Logging before the crash.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the application to write logs to Cloud Logging using the Logging agent. — Option D is correct because Cloud Logging with the Logging agent provides a centralized, durable, and managed log storage solution. The agent streams logs from the VM to Cloud Logging in near real-time, ensuring logs are preserved even if the VM or its local persistent disk fails. This decouples log storage from the VM's lifecycle, meeting the operations team's requirement for log durability.
What should I do if I get this PCA 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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