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<p>Created page with &quot;Add SAR notes here.&lt;/br&gt; https://www.thegeekdiary.com/how-to-view-past-performance-with-sar-in-linux/ By default, sar stats are collected every 10 minutes. The data is collected using a simple cron job configured within /etc/cron.d/sysstat. This job can be amended to collect the data as frequently as you require. Example /etc/cron.d/sysstat file is provided below. # cat /etc/cron.d/sysstat # Run system activity accounting tool every 10 minutes */10 * * * * root /usr...&quot;</p> <p><b>New page</b></p><div>Add SAR notes here.&lt;/br&gt;<br /> https://www.thegeekdiary.com/how-to-view-past-performance-with-sar-in-linux/<br /> <br /> <br /> By default, sar stats are collected every 10 minutes. The data is collected using a simple cron job configured within /etc/cron.d/sysstat. This job can be amended to collect the data as frequently as you require. Example /etc/cron.d/sysstat file is provided below.<br /> # cat /etc/cron.d/sysstat<br /> # Run system activity accounting tool every 10 minutes<br /> */10 * * * * root /usr/lib64/sa/sa1 1 1<br /> # 0 * * * * root /usr/lib64/sa/sa1 600 6 &amp;<br /> # Generate a daily summary of process accounting at 23:53<br /> 53 23 * * * root /usr/lib64/sa/sa2 -A<br /> <br /> <br /> <br /> ====Install Sar====<br /> ----<br /> <br /> $ apt-get install sysstat ### Debian-based distributions <br /> $ yum install sysstat ### RedHat Based distribution<br /> <br /> <br /> ====Sar log files====<br /> ----<br /> <br /> The historic data for various linux distribution is stored in below directories:&lt;/br&gt;<br /> 1. Red Hat, Fedora, CentOS, and Scientific Linux should use the &lt;b&gt;/var/log/sa&lt;/b&gt; directory<br /> 2. Debian, Mint, and Ubuntu users should use the &lt;b&gt;/var/log/sysstat&lt;/b&gt; directory<br /> <br /> <br /> ====How to view or read sar files====<br /> ----<br /> <br /> &lt;b&gt;-f&lt;/b&gt;: To read a sar log file:<br /> sar -f /var/log/sa/sa20<br /> 00:00:00 CPU %user %nice %system %iowait %steal %idle<br /> 23:25:00 all 2.16 0.00 0.77 0.00 0.05 97.02<br /> 23:35:00 all 2.52 0.00 0.71 0.00 0.05 96.71<br /> 23:45:00 all 6.33 0.00 0.12 0.00 0.01 93.53<br /> <br /> sar -f /var/log/sa/sa16 -b <br /> 00:00:00 tps rtps wtps bread/s bwrtn/s<br /> 23:25:00 92.24 0.00 92.24 0.00 966.27<br /> 23:35:00 87.08 0.00 87.08 0.00 1236.60<br /> 23:45:00 22.55 0.00 22.55 0.00 3812.81<br /> <br /> &lt;b&gt;-b&lt;/b&gt;: Report I/O and transfer rate statistics. The following values are displayed:<br /> tps<br /> Total number of transfers per second that were issued to<br /> physical devices. A transfer is an I/O request to a<br /> physical device. Multiple logical requests can be com‐<br /> bined into a single I/O request to the device. A trans‐<br /> fer is of indeterminate size.<br /> rtps<br /> Total number of read requests per second issued to physi‐<br /> cal devices.<br /> wtps<br /> Total number of write requests per second issued to phys‐<br /> ical devices.<br /> bread/s<br /> Total amount of data read from the devices in blocks per<br /> second. Blocks are equivalent to sectors and therefore<br /> have a size of 512 bytes.</div>

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