The next command pulls data on memory usage with three 5-second reports plus the averages.
%util Percentage of elapsed time during which I/O requests were issued to the device WkB/s Number of kilobytes written to the device per secondĭkB/s Number of kilobytes discarded for the device per secondĪreq-sz Average size (in kilobytes) of the I/O requestsĪqu-sz Average queue length of the requestsĪwait Average time (in milliseconds) for I/O requests RkB/s Number of kilobytes read from the device per second In the above example, the fields included in the above example include: DEV the device
If you delve into the sar man page, you'll find explanations of each data column. It includes two 5-second reports plus the averaging. Note that this report shows device usage with activity displayed for /dev/sda and /dev/sdb. You will then be able to run commands like these which collect performance details from your system: $ sar -d 5 2
If not, you will need to install it with a command like "yum install sysstat" or "apt install sysstat".
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