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2 ways to check disk IOPS in Linux

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Do you need to check your disk IOPS in Linux? If so, you’re in luck! In this blog post, we will discuss two methods that you can use to get this information. The first method is a command-line tool called iostat, and the second method is sar. Both of these tools are free and easy to use. Let’s get started!

what is disk IOPS in Linux?

Disk IOPS, or input/output operations per second, is a measure of the amount of work that your disk is doing. This metric can be helpful in determining the workload, health, and performance of your disk. IOPS= r/s + w/s for this disk device.

If using iostat without the -x option, the IOPS value is output under the tps (transactions per second) column.

Why would you need to check disk IOPS in Linux?

There are a few reasons why you might want to check your disk IOPS. For example, if you are experiencing slow performance from your disk. Checking the IOPS can help you determine whether or not the issue is with the disk itself. Additionally, if you are troubleshooting an issue with your disk, checking the IOPS can help you narrow down the problem.

Check Disk IOPS with iostat in Linux

The best way to check disk IOPS in Linux is using a command-line tool called iostat. This tool is part of the sysstat package, which is a collection of Linux system monitoring tools. The iostat command is used to monitor disk workload in real-time.

There are 3 ways to use iostat command in Linux.

  • iostat -xd: The “-d” option tells iostat to display information about the disk, and the “-x” option tells iostat to display extended statistics.
  • iostat -xd interval count: The interval parameter specifies the amount of time in seconds between each report. The count parameter can be specified in conjunction with the interval parameter. If the count parameter is specified, the value of count determines the number of reports generated at interval seconds apart. If the interval parameter is specified without the count parameter, the iostat command generates reports continuously.
  • iostat -xd device name: This will display the performance data about this device.

 

The first report generated by the iostat command provides statistics concerning the time since the system was booted, unless the -y option is used (in this case, this first report is omitted).

Each subsequent report covers the time since the previous report. All statistics are reported each time the iostat command is run. The report consists of a CPU header row followed by a row of CPU statistics.

On multiprocessor systems, CPU statistics are calculated system-wide as averages among all processors. A device header row is displayed followed by a line of statistics for each device that is configured.

To install sysstat on your Linux machine, use the following command: sudo apt-get install sysstat. Once sysstat is installed, you can use the iostat -xd command to check disk IOPS. When you run this command, you will see output that looks something like this:

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
xvda 0.00 0.00 100 50 50 100 10 3.00 0.00 0.00 5.00

This output can be a bit confusing, so let’s break it down. The IOPS for this device xvda is r/s + w/s = 100 + 50 =150

  • The “Device” column shows the name of the disk (in this case, xvda).
  • The “rrqm/s” column shows the number of read requests that were merged per second. The “wrqm/s” column shows the number of write requests that were merged per second.
  • The “r/s” column shows the number of reads per second, and the “w/s” column shows the number of writes per second.
  • The “rkB/s” column shows the number of kilobytes read per second, and the “wkB/s” column shows the number of kilobytes written per second.
  • The “avgrq-sz” column shows the average size of each request in sectors.
  • The “avgqu-sz” column shows the average queue length of the requests. The “await” column shows the average time (in milliseconds) that each request spent in the queue.
  • The “svctm” column shows the average service time (in milliseconds) for each request. And finally, the “%util” column shows the percentage of time that the disk was active.

 

 

Check Disk IOPS with sar command in Linux

The second method we will discuss for checking disk IOPS in Linux is using a command-line tool called sar. The sar command is used to collect, report, and save system activity information for historical data. This information can be used to find performance bottlenecks and to diagnose problems. The sar command can also be used to monitor CPU utilization, memory usage, disk I/O, and network activity.

This command can be used to get the historical performance data about your system. To install sar on your Linux machine, use the following command: sudo apt-get install sysstat. Once sysstat is installed, you can use the sar command to check disk IOPS. The syntax for this command is as follows: sar -d

How can I get historical performance data about my system in Linux?

You can use the sar command to get historical performance data about your system. You can use the sar command to monitor CPU utilization, memory usage, disk I/O, and network activity.

What are some tips for improving disk IOPS in Linux?

Here are a few tips for improving disk IOPS:

  • Make sure that your disks are in good condition. If they are damaged or worn out, they will not perform as well.
  • Make sure that your disks are properly configured. If they are not configured correctly, they will not be able to handle the load.

 

If you are still having problems with disk iops, you can try using a tool like iotop to help identify the problem. iotop is a Linux tool that allows you to see what processes are using the most I/O. This can be helpful in identifying which process is causing the problem.

You can install iotop using the following command: sudo apt-get install iotop. Once it is installed, you can use the following command to see which processes are using the most I/O: iotop -o.

This will show you a list of the processes that are using the most I/O, as well as the amount of I/O that they are using. You can then use this information to try and solve the problem.

I hope this article has helped you learn how to check disk IOPS in Linux. If you have any questions, feel free to leave a comment below. Thanks for reading!