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on our servers, typing sar show's the system load statistics for today starting at midnight, is it possible to show yesterdays statistics?

3 Answers 3

77

Usually, sysstat, which provides a sar command, keeps logs in /var/log/sysstat/ or /var/log/sa/ with filenames such as /var/log/sysstat/sadd where dd is a numeric value for the day of the month (starting at 01). By default, the file from the current day is used; however, you can change the file that is used with the -f command line switch. Thus for the 3rd of the month you would do something like:

sar -f /var/log/sysstat/sa03

If you want to restrict the time range, you can use the -s and -e parameters. If you want to routinely get yesterday's file and can never remember the date and have GNU date you could try

sar -f /var/log/sysstat/sa$(date +%d -d yesterday)

I highly recommend reading the manual page for sar.

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  • 13
    on our cPanel/CentOS systems it appears to be in /var/log/sa Jan 10, 2011 at 6:59
  • 1
    yup, centos it's: sar -b -f /var/log/sa/sa20 for the 20th of the month.
    – stantonk
    Jan 21, 2015 at 0:51
  • 5
    /var/log/sa for Redhat as well
    – sweetfa
    Feb 3, 2015 at 21:17
  • 1
    /var/log/sa in SUSE too Jan 29, 2016 at 12:09
8

Try the command as follows to get historic memory utilization details.

sar -r -f /var/log/sa/sa01

The files in /var/log/sa record everything in the world.

5

There is a "magic" parameter for that: -N, e.g. the following would display the yesterday's stats:

sar -1

Collect weekly data from many servers, put it to NFS:

parallel --tag --nonall -k -j 3 -S server1,server2,server3 \
  'of="/nfs-path/sar-$(hostname).out"; rm -f "${of}"; for N in {7..0}; do sar -A -$N 2> /dev/null >> "${of}"; done'

Those files can be loaded into kSar

1
  • this is so much better than the accepted answer, it's built into sar command, exactly what I hoped it could do! Oct 8, 2021 at 16:55

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