![]() we can use this tool to collect, report system activity. Sar command is a useful tool to check disk performance in Linux. check disk performance with sar command in Linux Ultimately the application has more control over the load point/mixture - the disk can only process the io, big or small random or sequential read or write, as presentedįor more information, you can read the iostat man page by running the following command:man iostat. Where the load point is comprised of the size of the io, the ratio of reads versus writes, how random or sequential that load is.ĭetermining a load alarm limit is highly dependent upon both the storage technology being used AND the application. With a single physical disk and its single physical disk head, once iostat reaches 100% then no additional io work can be done AT THAT LOAD POINT. ![]() In the case of a single physical disk (such as a direct attached SATA disk), %util represents roughly what percentage of the time the disk was working on an io. It does not represent anything useful in terms of actual load except in the case where you are dealing with a single physical disk. So with iostat 1 (sample rate of 1 second), a %util of 75% means there was at least 1 io outstanding to storage 750 milliseconds of the total 1 second sample time. It only represents the percentage of sample time during which at least one io was outstanding within the scheduler/driver/storage. You cannot determine how much I/O load is present from %util. This column shows the percentage of time that the disk is being used. The “%util” column shows the percentage of time that the disk is being used. The “svctm” column shows the average time that a request spends being processed. The “await” column shows the average time that a request spends waiting to be processed. The “avgqu-sz” column shows the average number of requests that are waiting to be processed. The “avgrq-sz” column shows the average size of the requests that are being processed. The “rkB/s” and “wkB/s” columns show the number of kilobytes that are being read and written per second. The “r/s” and “w/s” columns show the number of reads and writes that are being processed per second. You will see output that looks like this:ĭevice: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util To use this command, you can run the following command: iostat -xk 1 3įor example, if you run the following command: iostat -xk 1 3. The “iostat” command can be used to get more information about disk performance. If you see that the “iostat” command is showing a high rate of activity, it is an indication that your system is under a heavy load. The iostat command can generate the following types of reports: This information can be useful in understanding how your system is using its resources. This command will show you information about the input/output activity of your hard drive. The most common way to check disk performance in Linux is using the “iostat” command. sar – This command provides system activity information in a historical way, including disk activity.Ĭheck disk performance with iostat command in Linux.df – This command displays information about the amount of free space on each disk and partition.iostat – This command provides information about CPU and I/O statistics for devices and partitions.The following Linux commands can be used to check disk performance: This is an important task for any system administrator or developer who is responsible for maintaining a Linux server.īy understanding how to check disk performance, you can ensure that your systems are running smoothly and efficiently! 3 Linux Commands to check disk performance In this blog post, we will discuss three different ways to check disk performance in Linux.
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