Linux System Activity Report SAR Graphs
One of the extremely useful tools to get an overview of what system is doing is a SAR reports, We can see SAR stats by simply issuing the command: # sar Linux 3.0.74-0.6.8-default (hostname) 10/09/13 _x86_64_ 00:00:01 CPU %user %nice %system %iowait %steal %idle 00:10:01 all 0.25 0.00 0.18 0.02 0.00 99.56 In most cases it is run as daemon in system and create the stats every 10 minutes, We can also see current system statistics by issuing following command: # sar 2 5 which create report every 2 seconds for 5 times, Cron jobs can be find in sysstat file under cron.d directory: # cat /etc/cron.d/sysstat # Run system activity accounting tool every 10 minutes */10 * * * * root /usr/lib64/sa/sa1 1 1 # 0 * * * * root /usr/lib64/sa/sa1 600 6 & # Generate a daily summary of process accounting at 23:53 53 23 * * * root /usr/lib64/sa/sa2 -A The first cron sa1 gather systems stats every 10min by defaul