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Introduction
The unexpected 25% spike in VMware's vSAN storage latency for enterprise customers last week is a critical issue that demands immediate attention and thorough analysis. As we delve into this problem, we'll follow a systematic approach to identify, validate, and address the root cause while considering both short-term fixes and long-term strategic implications.
Framework overview
This analysis follows a structured approach covering issue identification, hypothesis generation, validation, and solution development.
Step 1
Clarifying Questions (3 minutes)
Why it matters: Recent changes are often the culprit in sudden performance issues. Expected answer: Yes, there was a minor update. Impact on approach: If yes, we'd focus on the update's contents and rollout process.
Why it matters: Helps determine if it's a global issue or specific to certain deployments. Expected answer: It's affecting 80% of enterprise customers. Impact on approach: If concentrated, we'd investigate common factors among affected customers.
Why it matters: Unusual data patterns could strain the system unexpectedly. Expected answer: No significant changes noted. Impact on approach: If yes, we'd examine data handling processes and capacity planning.
Why it matters: External dependencies could be causing bottlenecks. Expected answer: No major changes reported. Impact on approach: If yes, we'd coordinate with network teams and service providers for further investigation.
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