You can define z/OS UNIX users to RACF®. Alternatively, you can use
the ISPF shell to set up existing users with unique UIDs.
Rules: Note these rules:
- You must define the user to your security product as a z/OS UNIX user before
you try to make the user's file system available. If you do not, you
will get error messages when you try to make it available.
- The OMVS segment also contains the HOME directory and the first
PROGRAM that is executed when this user logs into z/OS UNIX or invokes
the OMVS TSO/E command. Make sure the HOME directory in the OMVS segment
matches the home directory that is defined for that user in the file
system.
- The recommended home directory for a user is /u followed
by the user ID; for example, /u/user1 would be the home directory
for the user1 ID.
- Make sure that unique UIDs are assigned to each user.
Although
you can assign the same UID to multiple users, it is not recommended.
However, it may be necessary for some cases, such as superusers. If
you assign the same UID to multiple users, control at an individual
user level is lost because the UID is used in z/OS® UNIX security
checks. Users with the same UID assignment are treated as a single
user during z/OS UNIX security checks.
Restriction: The limit on the number of user IDs that can
share a UID when the RACF database
is using AIM is 129.
z/OS UNIX System Services Planning
Copyright IBM Corporation 1990, 2014