EX280 Troubleshooting And Diagnostics Practice Question
An OpenShift cluster administrator receives an alert that etcd disk fsync durations are excessively high. Which performance metric is the etcd diagnostic tool measuring when evaluating disk latency?
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 time taken for etcd to commit WAL (Write-Ahead Log) entries to persistent storage via fsync.
etcd disk performance relies heavily on synchronous disk writes (fsync). High fsync duration indicates slow underlying storage block devices.
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 network round trip time between etcd follower and leader nodes.
Why it's wrong here
Network latency is measured separately via peer round-trip time, not fsync.
- ✓
The time taken for etcd to commit WAL (Write-Ahead Log) entries to persistent storage via fsync.
Why this is correct
High fsync latency directly degrades etcd stability, measured by disk write synchronization duration.
- ✗
The time taken by the Kubernetes API server to serialize JSON objects.
Why it's wrong here
API server serialization is a CPU/memory metric, not an etcd disk storage metric.
- ✗
The garbage collection duration of expired etcd keys.
Why it's wrong here
Key expiration cleanup is handled in memory and background compaction, not disk fsync.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official Red Hat exam blueprint
This EX280 practice question is part of Courseiva's free Red Hat 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 EX280 exam.