AIX Username Length

By default, AIX 5.3 has a user name length limitation of 8 characters, regardless of the back end authentication mechanism.

To confirm this, run:

getconf LOGIN_NAME_MAX

or

lsattr -El sys0 -a max_logname

To set the size limitation to a new (higher) value, run (where # is the new maximum user name length):

chdev -l sys0 -a max_logname=#