RHEL 6 limits.conf notes
You must edit two files:
/etc/security/limits.conf
The case of nprocs is particular in RHEL:
/etc/security/limits.d/90-nproc.conf
You can add more limits configuration files in the directory:
/etc/security/limits.d
Examples:
root soft nofile 8192 root hard nofile 8192 netcool soft nofile 8192 netcool hard nofile 8192