[Info-vax] Webinar "AUTOGEN and SYSGEN"

[Bart Zorn]

On Sunday, April 22, 2012 11:13:09 PM UTC+2, JF Mezei wrote:
> Bart Zorn wrote:
> 
> > The question remains: why did the presenter not verify his slide before the webinar?
> 
> At the time SYSBOOT runs, I am not sure there is already an "ACTIVE"
> version of the parameters since the VMS instance has not really been
> created yet.
> 
> Consider this HELP snipped from SYSBOOT> HELP:
> 
>     USE            - Set parameter file name
>          USE file_spec.PAR
>            Reserved filespecs are:
>              DEFAULT     Use permanent defaults
>              CURRENT     Use current values
> 
> 
> You can't use "ACTIVE". My guess is that when you enter the CONTINUE
> command, the "ACTIVE"  data structure is created from the parameters
> that SYSBOOT has read in (and possibly you modified wit a SET command).
> After that, the VMS instance can be created.
> 
> Note that there is no WRITE command in SYSBOOT>. lack of writing ability
> would explain the need of the   WRITESYSPARAMS parameter to set a flag
> that would allow the parameter file to be written later on.
> 
> 
> > SYSBOOT>  SHOW WRITESYSPARAMS
> > Parameter Name            Current    Default     Min.     Max.     Unit  Dynamic
> > --------------            -------    -------    -------  -------   ----  -------
> > WRITESYSPARAMS                  0          1         0         1 Boolean    D
> >
> 
> > 
> > SYSBOOT>  SHOW WRITESYSPARAMS
> > Parameter Name            Current    Default     Min.     Max.     Unit  Dynamic
> > --------------            -------    -------    -------  -------   ----  -------
> > WRITESYSPARAMS                  1          1         0         1 Boolean    D
> > 
> > SYSBOOT>  
> 
> Also, the USE CURRENT command at SYSBOOT undoes all changes you have
> done and resets WRITESYSPARAMS to 0
> 
> I think the guy giving the seminar would have given the right jist of it
> (parameters you change at SYSBOOT end up being written back to CURRENT)
> but was technically incorrect in how it is done.  If SYSBOOT is done by
> a different group, it may explain why the guy in charge of autogen would
> not be aware of what SYSBOOT really does.

The important points are that CONTINUE does NOT do an implicit WRITE CURRENT and that you can control whether a WRITE CURRENT is done or not done with the WRITESYSPARAMS parameter. The presenter did not know that.

Bart