On each BS2000 system, at least one pubset must exist which contains the system-specific data and files and must therefore be available throughout the complete BS2000 session. This special pubset is known as the home pubset. It cannot be connected to Net-Storage.
The system ID (SYSID) of the home pubset is used to identify the active system. It is entered in the disk occupancy information and in the path group ID. Controllers use the path group ID to differentiate between I/Os from different systems. For these reasons, it is essential that unambiguous system IDs are assigned when home pubsets are operated in parallel. When PUB notation is used this is always the case, provided that unique pubset IDs have been chosen. In the case of pubsets with point notation which are to be used as home pubsets, you must explicitly ensure that unique system IDs are used, see "Creating a shared pubset network".
BS2000 imports the home pubset at system initialization and it is exported at system shutdown. The home pubset is exported during system shutdown (when the SHUTDOWN command is processed). User files and job variables may be cataloged on the home pubset. This must, however, be permitted by systems support (ADD-USER or MODIFY-USER command).