You can use the nmon command on AIX® and Linux operating systems. Use the command to
display local system statistics in interactive mode and to record
system statistics in recording mode.
Procedure
- Run the command as root. You can run the command
from any directory, but you must be logged in as the root user. The
command starts a background process to capture the specified number
of snapshots of system statistics at the specified intervals, and
writes the output file.
Important: Do not use the kill command
to end the process because that causes the file to be incomplete and
unusable for analysis.
To run the command, use the following
parameters:
- -f
- Specifies that the output is written to a file. The file is created
in the directory where you run the command, with the name hostname_YYMMDD_HHMM.nmon.
- -s nnnn
- Specifies the seconds between snapshots of statistics.
- -c nnn
- Specifies the number of snapshots.
Typically to create a report
for performance analysis, you specify 15 minutes between snapshots
(900 sec) over 24 hours (96 snapshots). For example, issue the following
command:
nmon -f -s 900 -c 96
To collect
a snapshot of the system every hour for seven days, issue the following
command:/home/hm12857/netmon/nmon -f -s 3600 -c 168
To
collect a snapshot of the system every 30 minutes for five days, issue
the following command: /home/hm12857/netmon/nmon -f -s 1800 -c 240
- Analyze the data by using the nmon Analyzer
spreadsheet tool. Focus on the disk-busy statistics (Disk
%Busy). Look for disks that are consistently over 80%
busy (weighted average). The weighted average is shown in red in the
chart on the diskbusy tab.
