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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.
