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Beyond 60% utilization, the average response time doubles…

“Beyond 60% utilization, the average response time doubles. By 80%, it has tripled. As disk I/O latency is often the bounding resource for an application, increasing the average latency by double or higher can have a significant negative effect on application performance. This is why disk…” quote by Brendan Gregg
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““Beyond 60% utilization, the average response time doubles. By 80%, it has tripled. As disk I/O latency is often the bounding resource for an application, increasing the average latency by double or higher can have a significant negative effect on application performance. This is why disk utilization can become a problem well before it reaches 100%, as it is a queueing system where requests (typically) cannot be interrupted and must wait their turn.””

Brendan Gregg

About This Quote

This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.

High disk utilization dramatically increases latency, causing performance problems before full capacity is reached.

In simple terms: Disk usage spikes cause latency spikes.

Key Takeaway

Monitor and limit disk utilization.

Themes

technology performance disk I/O latency capacity planning system design

Mood

technical analytical cautious

Type

Technology:1 Time:0 Latency:1 Disk Latency:1 Disk Utilization:1 Average Latency:1 Latency Double:1

When to use this quote

  • server administration
  • cloud infrastructure
  • database tuning
  • application scaling

Key Concepts

computer science queueing theory resource management

Questions to Reflect On

  • How to detect early signs of I/O saturation?
  • What alternatives reduce disk load?
A Different Perspective

Latency can also arise from other bottlenecks.

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