12-18-2008
Have a look at ndisk in this link maybe:
IBM developerWorks: Wikis - AIX - nstress
Also if you try to simulate I/O traffic on disk with such a tool, it will not necessary be the same kind of traffic like you have in your production environment. It might me just ok to see what max bandwith and number of I/O transactions will be ok for it.
For analyzing your actual performance problem on disks, you should investigate more on your systems where these occure.
If you need help, let us know. Without investigation it could be something different than it looks at first.
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lpx(8) System Manager's Manual lpx(8)
Name
lpx - line printer exerciser
Syntax
/usr/field/lpx [ -h ] [ -ofile ] [ -pn ] [ -tm ] -ddev
Description
The line printer exerciser outputs a rolling character pattern to the printer. Five pages are output and then the printer will pause for 15
minutes (default). Then 5 more pages are output, followed by a pause. This pattern continues until the process receives a or a kill -15
pid.
Disable the line printer queue of the printer to be tested before running Check the file to determine the line printer queue, and then run
line printer control program to disable the printer. This will stop other jobs from interfering with the testing.
Arguments
You must specify the following function flag and its argument to the exerciser:
-ddev
The line printer device name and unit number to test as listed in the directory. For example, lp, lp1.
Options
The options are:
-h Prints the help messages for the command.
-ofile
Saves the output diagnostics in file.
-pn Sets pause for n minutes. During the pause period, will only exercise the controller, saving paper. The default value for n is 15.
A value of n = 0 indicates no pause.
-tm Specifies the run time in minutes (m). The default is to run until the process receives a or kill -15 pid.
Restrictions
If there is a need to run a system exerciser over an NFS link or on a diskless system there are some restrictions. For exercisers that
need to write into a file system, such as the target file system must be writable by root. Also the directory, in which any of the exer-
cisers are executed, must be writable by root because temporary files are written into the current directory. These latter restrictions
are sometimes difficult to overcome because often NFS file systems are mounted in a way that prevents root from writing into them. Some of
the restrictions may be overcome by copying the exerciser to another directory and then executing it.
Examples
The following example causes to exercise lp1 until the process receives a or kill -15 pid.
% /usr/field/lpx -dlp1
The following example exercises lp for 120 minutes in the background.
% /usr/field/lpx -t120 -dlp &
See Also
Guide to System Exercisers
lpx(8)