Do not reboot just enable IOCP

First list status

[root@prnim01]/root# lsdev -Cc iocp
iocp0 Defined  I/O Completion Ports
[root@prnim01]/root# lsattr -El iocp0
autoconfig defined STATE to be configured at system restart True

Enable iocp and also at reboot

[root@prnim01]/root# mkdev -l iocp0
iocp0 Available
[root@prnim01]/root# chdev -l iocp0 -a autoconfig='available' -P
iocp0 changed