A very good page for IBM and Oracle customer, there are many articles from IBM about how to configuration their product to support Oracle products.

https://www.ibm.com/developerworks/community/blogs/fd4076f7-7d3d-4080-a198-e62d7bb263e8?lang=en

One of the article is very good for Oracle 12c DBA:

Oracle DB & RAC 12cR1 and R2 on IBM AIX : Tips and Considerations

http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP102425

AIX check user account status

Enter the following command:

• Lsuser “login name”

Check the value of “unsuccessfully login = x” If x > 10 (The lockout value), account locked

To unlock the user account:

Enter the following command:

• Smit user

select - Reset User's Failed Login count

Enter <user name>

Done