How to extract sar file install#
How to extract sar file plus#

This can often help you answers questions like 'What's different today?' - often the first question you're likely to ask yourself when problems arise. This allows you to review performance on recent dates and compare what you're seeing with current stats. You can easily set sar up to run automatically on your system, store its collected stats in daily files, produce daily reports and remove the oldest of the files after a given number of days (default is 28). Keep in mind that the data file created (sarfile in this example) will not be a text file that you can display with a cat or more command. To save the output from a command like this in a file, you could run the command like this: $ sar -o sarfile 6 2 In other words, sar is collecting the data as directed and displaying it. The sar commands shown above are all using real time data. Using a wide terminal window will clearly make the details a lot easier to view.

How to extract sar file plus#

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 secondДkB/s Number of kilobytes discarded for the device per secondДЄreq-sz Average size (in kilobytes) of the I/O requestsДЄqu-sz Average queue length of the requestsДЄwait 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

How to extract sar file install#

If not, you will need to install it with a command like 'yum install sysstat' or 'apt install sysstat'.