You can specify that users who do not have an OMVS segment will be assigned
a default OMVS segment, allowing OMVS processes to run on behalf of their userid.
An OMVS segment is required to make use of TCP/IP services such as the FTP server
on OS/390 V2R5 and up. An OMVS segment specifies the UID to be used, the home directory and the shell program name.
The following considerations apply whenever more than one user will be
sharing an OMVS uid:
These considerations also apply to users making use of the default OMVS segment. Note that address spaces making use of TCP/IP functions may use
the default OMVS segment if they have not been assigned their own OMVS segment.
- the MAXPROCUSER limit specifies the maximum number of processes
allowed for each UID at any given time. While this limit is exceeded for a given UID,
no more processes will be created under that UID.
- one user can use the Unix System Services kill process function for another user's processes
- any HFS files created will have the same ownership
One way to see who is using a default OMVS segment is to run the
rexxps REXX from the OpenEdition REXX page using
a user who does not have his own OMVS segment.
Refer to the documentation for your security product for more information
about creating a default OMVS segment.