sar_commands []

Common Sar Commands

        
              sar -u 
sar -q
sar -b
sar -B
sar -d (device)
sar -n DEV
sar -n SOCK

Show all statistics for current day:

        
              sar -<option>

Show statistics 3 times with 1 second interval

        
              sar -<option> 1 3

Show CPU statistics 3 times with 1 second interval, (focus on the last field “%idle” to see the cpu load):

        
              sar 1 3

CPU usage of ALL CPUs

        
              sar -u 1 3

Load average

        
              sar -q

Swap Space

        
              sar -S

Viewing specific time and date

Select a specific time during the day:

        
              sar -<option> -s 10:30:00

        
              sar -q -f /var/log/sa/sa23 -s 10:00:01

        
              sar -p | grep -A5 "07:45"

Finding every occurrence the load increased above the recommended amount

Change the value 4 to the number of CPUs you have

        
              sar -q | awk '$5 > 4'

Summary of logs

RAM

        
              for i in $(ls -tr /var/log/sa/sa[0-9][0-9]); do echo $(ls -l $i); sar -r -f $i | awk '$4 > 98.8'; done | awk '!/Average|Linux/'

CPU

        
              for i in $(ls -tr /var/log/sa/sa[0-9][0-9]); do echo $(ls -l $i); sar -u -f $i | awk '$8 > 20'; done | awk '!/Average|Linux/'

load

        
              load=$(grep -ic 'model name' /proc/cpuinfo ); for i in $(ls -1tr /var/log/sa/sa[0-3]*| grep -v '.bz2'); do echo "$(stat --printf='%.16y...' $i)"; sar -q -f $i | awk ' $6 > '"$load"' {print $0}' | grep -v 'Average\|x86'; echo ''; done

        
              for i in $(ls -tr /var/log/sa/sa[0-9][0-9]); do echo $(ls -l $i); sar -q -f $i | awk '$5 > 1'; done | awk '!/Average|Linux/'

Block Device I/O Activities

        
              for i in $( ls -tr /var/log/sa/sa[0-9][0-9]); do echo $(ls -l $i ); sar -p -d | awk '$11 > 80'; done | awk '!/Average|Linux/'