Using LTOM on AIX 7.1: option rss of ps is not valid.

Hello,

I am running LTOM ( Lite Onboard Monitor ) on an AIX 7.1 system.

The LTOM is throwing the following error mesage when running the unix command "ps -eo pid,pcpu,time,rss,vsize".

CURRENT STATUS: HangDetection=OFF Profiling=ON AutoRec=OFF SessionRec=OFF
Please Select an Option:exit value was 1
cmd was ps -eo pid,pcpu,time,rss,vsize
exit value was 1
cmd was ps -eo pid,pcpu,time,rss,vsize
exit value was 1

The issue is that the option rss seems not to be a valid option for ps command.

$ ps -eo rss
ps: 0509-048 Flag -o was used with invalid list.