Sun Microsystems SPARC Series, Service Manual

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3-18 SPARC Enterprise M3000 Server Service Manual • January 2009
Most of these commands are located in the
/usr/bin directory or /usr/sbin
directory
.
3.6.1 Using the
iostat
Command
The
iostat
command repeatedly reports terminal, drive, and I/O activity, as well
as CPU utilization.
3.6.1.1 Options
TABLE 3-6
lists the options of the
iostat
command and how those options can help
troubleshoot the server.
TABLE 3-6
Options for
iostat
Option Description How it can help
No option Reports status of local I/O devices. A quick three-line output of device status
information.
-c
Reports the percentages of time the system has
spent in user mode, in system mode, waiting
for I/O, and idling. Quick report of CPU status
-e
Displays device error summary statistics.
Displays the total number of errors, hardware
errors, software errors, and transfer errors. Provides a short table with accumulated
errors. Identifies suspect I/O devices.
-E
Displays all device error statistics. Provides information about devices:
manufacturer, model number, serial number,
size, and errors.
-n
Displays names in a descriptive format. The descriptive format helps identify devices.
-x
Reports extended drive statistics of each drive.
The output is in a tabular form. Similar to the
-e
option, but provides rate
information. This helps identify internal
devices with poor performance and other I/O
devices with poor performance across the
network.