Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Información técnica descargar pdf (Pagina 27)

System Monitoring Utilities 13

the fly or query existing reports gathered by the system activity data collector (sadc).

sar and sadc both gather all their data from the /proc file system.

NOTE: sysstat Package

sar and sadc are part of sysstat package. You need to install the pack-

age either with YaST, or with zypper in sysstat.

2.1.2.1 Automatically Collecting Daily Statistics

With sadc

If you want to monitor your system about a longer period of time, use sadc to au-

tomatically collect the data. You can read this data at any time using sar. To start

sadc, simply run /etc/init.d/boot.sysstat start. This will add a link

to /etc/cron.d/ that calls sadc with the following default configuration:

• All available data will be collected.

• Data is written to /var/log/sa/saDD, where DD stands for the current day. If a

file already exists, it will be archived.

• The summary report is written to /var/log/sa/sarDD, where DD stands for

the current day. Already existing files will be archived.

• Data is collected every ten minutes, a summary report is generated every 6 hours

(see /etc/sysstat/sysstat.cron).

• The data is collected by the /usr/lib64/sa/sa1 script (or /usr/lib/sa/

sa1 on 32-bit systems)

• The summaries are generated by the script /usr/lib64/sa/sa2 (or /usr/

lib/sa/sa2 on 32-bit systems)

If you need to customize the configuration, copy the sa1 and sa2 scripts and adjust

them according to your needs. Replace the link /etc/cron.d/sysstat with a

customized copy of /etc/sysstat/sysstat.cron calling your scripts.

2.1.2.2 Generating reports with sar

To generate reports on the fly, call sar with an interval (seconds) and a count. To

generate reports from files specify a filename with the option -f instead of interval

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Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Información técnica Pagina 27