New error on TSM6.3.3 ANR3619W. How to fix

Hi.

After upgrading my servers to TSM 6.3.3 I am getting this message in the act log.

ANR3619W The user limit for open files is below the recommended minimum value of 4096.

I have tried to search the forum an internet, but haven't find anything useful.
IBM say: User response - Set the user limit so that it is equal to or greater than the recommended minimum value.

My problem is where to set this parameter TSM or the Operating system

Could someone please help me with this.

TSM is running on RedHat 6.4 (Santiago)

Ivan
(Sorry for my terrible English)