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2.5.4.3. The sadc command
As stated earlier, the
sadc
command collects system utilization data and writes it to a file for later analysis. By default, the data is written to files in the /var/log/sa/
directory. The files are named sa<dd>
, where <dd>
is the current day's two-digit date.
sadc
is normally run by the sa1
script. This script is periodically invoked by cron
via the file sysstat
, which is located in /etc/cron.d/
. The sa1
script invokes sadc
for a single one-second measuring interval. By default, cron
runs sa1
every 10 minutes, adding the data collected during each interval to the current /var/log/sa/sa<dd>
file.