Advanced POWER Virtualization on IBM System p5 - Previous ...

The sysstat command
The sysstat command tells you briefly about the overall performance of the
system and displays user sessions. Example 5-41 shows the syntax.
Example 5-41 Usage message of the sysstat command
$ sysstat -h
Usage: sysstat [-long | -short] [user]
Prints a summary of current system activity.
-long
Prints the summary in long form. This is the default.
-short Prints the time of day, amount of time since last system startup,
number of users logged on, and number of processes running.
Example 5-42 provides an example output of the sysstat command.
Example 5-42 Example output of the sysstat command
$ sysstat -long
03:29PM up 1:20, 2 users, load average: 0.51, 0.56, 0.50
User tty login@ idle JCPU PCPU what
padmin vty0 02:09PM 22 1 0 -rksh
padmin pts/0 02:16PM 0 0 0 -rksh
The viostat command
The viostat command can be very helpful in tracing system activity with regard
to questions related to I/O. It allows for relatively fine-grained measurements of
different type of adapters and attached disks as well as the usage of paths to
redundant attached disks, including virtual adapters and virtual disks as well as
their backing devices.
The usage message of this command is shown below in Example 5-43
Example 5-43 Usage message of the viostat command
$ viostat -h
Usage: viostat [-sys] [-adapter] [-disk | -extdisk | -tty] [-path] [-time]
[PhysicalVolume...] [Interval [Count]]
viostat
Reports Central Processing Unit statistics, asynchronous input/output,
input/output statistics for entire system, adapters, tty devices,
disks and CD-ROMs.
-sys
A system-header row is displayed followed by a line
of statistics for the entire system. The hostname of
344 <strong>Advanced</strong> <strong>POWER</strong> <strong>Virtualization</strong> on IBM System p5