file size limit

Can anybody help me?

How to increase file size limit in aix 5.2? I have already specified in /etc/security/limits file :
default:
fsize = -1
core = 2097151
cpu = -1
data = -1
rss = -1
stack = -1
nofiles = 2000

change the ulimit parameter

chuser rss=<value> <username>
chuser fsize=<value> <username>
chuser data=<value> <username>

To change with no reboot required