The DCAS server runs as a system daemon and must be started under a controlled user ID that has superuser authority (that is, not an end-user or system programmer user ID). To define the user ID to use OMVS services, use the following command:
ADDUSER dcasid DFLTGRP(OMVSGRP) OMVS(UID(0) HOME('/'))
where dcasid is the name of the user ID.