IBM i > TIPS & TECHNIQUES > SYSTEMS MANAGEMENT

Why Consider Multiple Subsystems?



You can get quite complex with routing entries, setting them up so that users can be directly taken to the application when they sign on. In addition, multiple routing entries can be used to set up different performance characteristics for multiple users within a subsystem. To investigate the options available by using routing entries, refer to the aforementioned Work Management book.

 

7. Add workstation entries to the subsystem description. This is the key step for assigning which devices are allocated to which subsystem. The devices an interactive subsystem allocates are determined by the workstation entries added to the subsystem description. The workstation entry identifies either the workstation name or type, and the allocation it should do for those workstations. The key to this is the Allocation parameter (AT). AT(*SIGNON) tells the subsystem that it should attempt to allocate these devices and put up a sign-on display when possible. AT(*ENTER) tells the subsystem not to allocate the device and not to put up a sign-on display.

However, the AT(*ENTER) does allow the specified workstation devices to transfer into that subsystem with the TFRJOB command.

You must determine which subsystems should allocate which devices. In addition, determine if you need to allow the use of TFRJOB from one subsystem to another.

Start the subsystems using the Start Subsystem (STRSBS) command. Sign on to the system using devices with various names, and verify that the job starts in the proper subsystem using the Work with Subsystem Jobs (WRKSBSJOB) command. It's a good idea to modify the system startup program to automatically start these subsystems to avoid manually starting them each time the system is taken to the restricted state or restarted. See “Changing the IPL Start-up Program” for more information on how to change your IPL start-up program.

Conclusion
This article provided the specific steps needed to set up the interactive subsystems. Next month's follow-up article outlines considerations for setting up workstation entries.

 

Dawn May is an IBM i consultant. She owns Dawn May Consulting, LLC in the Greater Boston area.


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