Change AS/400 Subsystem from QINTER to QCTL

Tags:
AS/400
AS/400 subsystem
iSeries
QCTL
QINTER
I would like to change my subsystem from QINTER to QCTL. How can I change it? Whenever I open an AS/400 system, it automatically opens with QINTER. Why not anything else? Please advise how we get QINTER on login screen? Thank you.
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  • Splat
    Using the controlling subsystem (QCTL), excepting those times when the system is in a restricted state, is not advised.

    What problem are you trying to address by creating additional interactive subsystems?
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  • TheRealRaven
    Whenever i open an AS400 system...

    What do you mean by "open"? What are you "opening"?

    ...it automatically opens with QINTER...

    If QINTER is your configured interactive subsystem, that's what it should do.

    ...change my subsystem from QINTER to QCTL.

    Why? What are you needing to do in QCTL? What problem are you trying to solve that can't be done in QINTER?

    A normal interactive job should not run in QCTL. The QCTL subsystem should only be used by the system console or by jobs performing system maintenance when the normal interactive subsystem is not available.
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  • sivaknagula
    Thank you for your response. Let me make my question more clear. I am not facing any issues and I   just wanted to understand more about subsystems.

    If I start a normal AS400 system, it automatically takes QINTER and if I go through HMC it takes QCTL. Here I got this question. How system is working with subsystems? and I hope somewhere on the system it is already defined. Isn't it ? Please advise.

    One more... I wanted to know...is there any way to change subsystem from QINTER to QCTL ? If we are already on QINTER.

    Thank you.
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  • TheRealRaven
    Subsystems are two general types -- batch and interactive. The primary characteristic that determines interactive is that it has workstation entries, either names or types. If a subsystem allows workstation jobs to enter it, it's an interactive subsystem.

    Run a WRKSBS command to list your active subsystems. Enter option 5='Display subsystem description' against any of them. Take option 4 or 5 from the menu to see if workstation entries have been associated. If entries are shown, then workstations that match the entries are allowed to enter that subsystem.

    Normally, you'll see that both QINTER and QCTL will have similar entries. That generally means that either one can accept any device.

    The reason that QINTER practically always takes your device is that device allocation happens when a subsystem is started and that the last subsystem to request allocation is the one that gets control of the device. QCTL is usually assigned as the "controlling" subsystem, so it starts before any other. It then starts the others, so they get to make the final allocation requests and that's where devices end up.

    An interactive job can move to another subsystem (a *SBSD) by running a TFRJOB command. The JOBQ() parameter of the command names a *JOBQ. If the *JOBQ is associated with an active *SBSD and the *SBSD allows the device, the job begins running in the other *SBSD.

    An interactive job running in QINTER can usually run TFRJOB QCTL and be transferred into QCTL. An administrator can determine who can transfer to where by controlling workstation entries and who can use what workstation devices.

    Normal interactive jobs should run in QCTL mostly because QCTL jobs run under the QCTL *CLS ("class"). The QCTL *CLS give high priority to jobs, so other jobs in the system may need to suspend their processing while a QCTL job runs. That can be disruptive.
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  • sivaknagula
    Thank you so much mate.
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