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Chapter 14. Monitoring and tuning z/VM and Linux 255

To turn on the built in kernel monitoring, use the echo command to send a non-zero value

into four of the five monitoring variables in the /proc/ virtual file system:

# echo 1 > /proc/sys/appldata/timer

# echo 1 > /proc/sys/appldata/mem

# echo 1 > /proc/sys/appldata/os

# echo 1 > /proc/sys/appldata/net_sum

Built-in kernel monitoring should now be turned on.You may only want to leave the monitoring

on for specific periods of time. As Linux monitoring data is captured, the Performance

Toolkit’s minidisk space can fill up relatively quickly.

14.4 Viewing Linux data in the Performance Toolkit

After the system has had some time to collect data, you should be able to use the

Performance Toolkit to view Linux performance data. To view that data, drill down into menu

29, Linux systems. This can be done either from the browser interface or the 3270 interface,

as shown in Figure 14-4.

Figure 14-4 Linux Guest Systems submenu

Then type S over the period on the left side of the submenu panel in the row corresponding to

the report you want to see. You should see a new report panel with the Linux guest systems

CPU overview.

You can also use a web interface to view the same data. You would drill down into menu 29

Linux systems and should see that the drill down links for LXCPU (Linux CPU), LXMEM

(Linux memory), and LXNET (Linux Network) are hot.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 275