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What is SYSTEM NUCLEUS and SYSGEN in SYSABEND

 
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jeevanshivain

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Joined: 07 Apr 2005
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PostPosted: Fri Apr 08, 2005 2:25 pm    Post subject: What is SYSTEM NUCLEUS and SYSGEN in SYSABEND
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hello to every one

what is system nucleus and SYSGEN? i found it when i was reading SYSABEND? what kind of information it holds?how i retrieve that?please any one?
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mmwife

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Joined: 30 May 2003
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PostPosted: Sun Apr 10, 2005 1:12 am    Post subject:
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The system nucleus is the part of the control pgm (OS) that is loaded into internal memory at IPL time. It resides in main memory until the next IPL and contains among other things cntl blocks, data areas, in memory functions, etc. necessary to running the system. It is, as its name implies, the center of the operating system.

SYSGEN is the process used to create the operating system (environment) for a system. What those characters mean in the dump I can't say. They may be just a name someone at IBM chose to use for a data field. It may be something involved in doing SYSGENs for other systems from the system represented by the SYSABEND listing you're looking at. I'm not sure they can do that. Years ago most SYSGENs were done from a standolone system.
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saidharrao
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PostPosted: Sun Apr 10, 2005 12:02 pm    Post subject: Re: What is SYSTEM NUCLEUS and SYSGEN in SYSABEND
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what is IPL?
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jeevanshivain

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PostPosted: Sun Apr 10, 2005 6:02 pm    Post subject: Re: What is SYSTEM NUCLEUS and SYSGEN in SYSABEND
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thanks mmwife.

i understand what is sysnucleus.

what kind of information it gives when we r using sysabend.

coud u explain me?

thanks and regards,

jeevan
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mmwife

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PostPosted: Mon Apr 11, 2005 1:46 am    Post subject:
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Hi saidhar,

IPL is
Initial
Program
Load

That's part of what the operators do to "bring up the system".


Hi jeevan,

Quote:
what kind of information it gives when we r using sysabend

What you see in a SYSABEND listing is a snapshot of the system at the time of the abend. Some problems are caused by OS malfunctions as opposed to application problems. Generally OS problem determination requires looking at the code and/or data in the nucleus as well as other parts of the OS.

Some have spent their careers answering your question in detail. To answer that question one must understand the inner workings of the IBM OS running at the time of the abend.

If you REALLY want to know the full answer go to IBM's website and search for the PLMs (Progam Logic Manuals). Don't know if they still call them that. They describe the inner workings of the OS and explain all the pgm logic and data areas used and how they're connected, updated, created, deleted, etc.

Once you know all that you can look at a dump and chain thru the cntl blks, etc. and determine the cause of the abend. Good luck, post us back in about 10 yrs or so and let us know how you made out. icon_cool.gif
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jeevanshivain

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PostPosted: Mon Apr 11, 2005 9:51 am    Post subject: Re: What is SYSTEM NUCLEUS and SYSGEN in SYSABEND
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thanks mmwife.

regards,
jeevan.
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saidharrao
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PostPosted: Mon Apr 11, 2005 10:31 pm    Post subject: Re: What is SYSTEM NUCLEUS and SYSGEN in SYSABEND
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Thank you MMwife,

Reards,
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Anbudan

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Joined: 07 Sep 2005
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Location: Germany

PostPosted: Thu Dec 08, 2005 6:15 pm    Post subject:
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Hi mmwife

Can you tell me more about "system IPL" or

any book reference or

site reference

Please

Regards
Anbudan
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