How to verify max user proc over AIX?

root@xxxxxx:/# lsattr -El sys0 -a maxuproc
maxuproc 128 Maximum number of PROCESSES allowed per user True

How to change?

root@xxxxxx:/# chdev -l sys0 -a maxuproc=256
sys0 changed

root@xxxxxx:/# lsattr -El sys0 -a maxuproc
maxuproc 256 Maximum number of PROCESSES allowed per user True