Troubleshooting IO performance issues on Linux

TECSTER
28 Jan 202007:14

Summary

TLDRThis instructional video delves into troubleshooting I/O performance issues on Linux systems. The presenter guides viewers through diagnosing bottlenecks by using the 'top' command to identify high I/O wait percentages, suggesting an I/O issue. They then demonstrate using 'iostat' with flags to pinpoint the problematic disk and 'iotop' to identify processes causing excessive I/O usage. The video concludes with strategies for dealing with the identified processes, offering practical solutions for system performance optimization.

Takeaways

  • 🔍 The video focuses on troubleshooting I/O performance issues on Linux servers.
  • 📈 CPU wait percentage can indicate I/O bottlenecks; values over 10-20% are concerning.
  • đŸ’Ÿ The script demonstrates checking disk usage with 'top' and identifying I/O intensive processes.
  • 🛠 To pinpoint performance issues, the 'iostat' command is used with flags like -H and -x for better readability and extended statistics.
  • 📊 The 'iostat' command with -m flag can display output in megabytes per second for clarity.
  • ⏱ Setting up 'iostat' to report every second helps in monitoring I/O usage over time.
  • 📍 The script identifies 'xvdf' as the disk with performance issues based on the 'iostat' output.
  • 🔎 'iotop' is a useful command to find processes causing high I/O usage, but it may not be installed by default.
  • 🛑 The '-o' flag in 'iotop' filters and shows only processes doing I/O operations on the specified disk.
  • 📝 The video concludes by identifying specific processes consuming I/O resources, suggesting actions like termination or waiting for completion.
  • 👍 The tutorial aims to help viewers understand and resolve I/O performance bottlenecks on Linux systems.

Q & A

  • What is the main topic of the video?

    -The main topic of the video is troubleshooting I/O performance issues on Linux.

  • What is the first step the video suggests to identify a bottleneck on a Linux server?

    -The first step is to use the 'top' command to get a general idea of the resource usage on the machine, specifically looking at the CPU wait percentage.

  • What does a high CPU wait percentage indicate in the context of the video?

    -A high CPU wait percentage, typically above 10 or 20 percent, indicates that there is an I/O bottleneck.

  • Which command is used to pinpoint which disk is experiencing performance issues?

    -The 'iostat' command is used to determine which disk is experiencing performance issues.

  • What flags are suggested to make the 'iostat' output more useful in the video?

    -The '-H' flag for human-friendly output, '-x' to emit the extended statistics report, and '-m' to print the output in megabytes per second are suggested.

  • How can you find out which process is causing high I/O usage on a specific disk?

    -You can use the 'iotop' command with the '-oH' flag to show only the processes or threads doing I/O operations on the specified disk.

  • Why might the video recommend installing 'iotop' if it's not available by default?

    -The 'iotop' command provides a detailed view of I/O usage by processes, which is useful for identifying I/O bottlenecks, hence it might not be installed by default but is recommended for troubleshooting.

  • What does the video suggest doing once the processes causing I/O issues are identified?

    -The video suggests that you can either terminate the processes if they are illegitimate or abusive, or allow them to finish if they are legitimate but resource-intensive.

  • What is the significance of identifying the processes using all of the I/O resources on a machine?

    -Identifying these processes allows system administrators to manage resources better, address potential performance issues, and ensure that the system runs efficiently.

  • How can the information from the video script help in optimizing Linux server performance?

    -By following the steps to identify and address I/O bottlenecks, the script helps in optimizing server performance by ensuring that I/O resources are not being monopolized by unnecessary or inefficient processes.

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Étiquettes Connexes
LinuxIO PerformanceTroubleshootingServerBottleneckDisk UsageCPU WaitIO TopResource ManagementPerformance Optimization
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