Troubleshoot a website outage with disk full

Q: Troubleshoot a website outage with disk full

This question evaluates operational incident response and systems troubleshooting skills, including understanding of disk/storage behavior, log and metric analysis, and architecture-level impact assessment within the Software Engineering Fundamentals domain.

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You are on-call for a production web service. Users report the website is down (timeouts/5xx). You are told the incident turns out to involve a full disk on one or more machines.

Walk through how you would:

Triage and confirm impact/scope.
Identify the failing component(s) and the immediate cause.
Debug “disk full” deeply (what to check next and why).
Mitigate quickly and safely.
Prevent recurrence (monitoring, alerting, operational changes).

Assume a typical setup (load balancer → web/app tier → DB/cache; logs/metrics available). Explain what commands/signals you would look at, what hypotheses you would test, and what pitfalls you’d avoid.

Troubleshoot a website outage with disk full

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