Find large objects on IFS

Posted on 2013-01-24
Medium Priority
Last Modified: 2013-01-24
Is there a way to list all the large files on the IFS for disk clean up purposes?
Question by:roosterup

Accepted Solution

rward earned 1000 total points
ID: 38814452
There are a couple ways you could go about this.  

The first way is to use the Disk Space collection tool built into OS/400.  In a 5250 session type command: GO DISKTASKS  then take option 1 to collect all disk information.  Once the information has been collected you can use the 2nd option to print the information.  Select the type of report to print as Specific Object then select the object type as *STMF and set the smallest size in bytes you want to list on the report.  

Another way to list files greater than a certain size is to use a shell command.  In 5250 session enter command QSH then use the find command:

find / -type f -size +100000 -exec ls -lrt {} \;|sort -r +4

This will find all files from the root down that are larger than 100000 512bytes blocks and sort the list from largest size to smallest.  You can further use the redirect > to redirect the std output to a text file.

LVL 36

Assisted Solution

by:Gary Patterson
Gary Patterson earned 1000 total points
ID: 38815484
IBM support article:


Good thread on the subject:


If you have PASE installed on your AS/400, you can use the AIX "du" command to find large IFS objects:

For each directory you want to scan (don't start in the root folder):

> cd /QOpenSys (or whatever folder you want to scan)
> du -a -k | sort -n -r | head -n 20

I'd usually repeat this for all the root-level IFS directories except for QOPT, QSYS.LIB, QFileSvr.400, and QNTC.
That will run the du command for the current folder, sort the output, and list the top 20 largest files or directories found.  Directory sizes are recursive, meaning it shows the sum of all the files in that directory and all subdirectories.

Sizes reflect actual disk consumption, and the "-k" option reports in kilobytes.

If you aren't familiar with PASE, it is an AIX execution environment that runs under OS/400 (i5/OS, iOS, i).  Here's info about PASE and qshell (BASH-like command shell for the AS/400):


And here is a link to the AIX "du" command docs:


- Gary Patterson

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