Two values must be changed:
rlimit_nofile_cur – specifies the current number of file descriptors available to a process.
rlimit_nofile_max – specifies the maximum value rlimit_nofile_cur may hold.
To change these values, enter:
# /usr/sbin/systune -i
Updates are made to running systems and to /unix.install.
systune-> rlimit_nofile_max 1024 rlimit_nofile_max = 2500 (0x9c4) ll Do you really want to change rlimit_nofile_max to 1024 (0x400)? (y/n) y
Restart the server for the change to rlimit_nofile_max to become effective.