Debian User Forums

Hello,
Does anyone have experience with SAR? I installed SAR, then I activated and executed it using the following commands This program created the file /var/log/sysstat/sa21. I want to know if SAR is automatically recording system activities or need to write cron file?

Thank you.

If /var/log/sysstat/sa21 is created, and sysstat is enabled in /etc/default/sysstat, and systemctl has enabled and started it, then a command like:

sar -u

would normally show output of the current CPU usage for the current day. If it's not working, the output will say that sysstat can't open the relevant file.