Discussion:
Re. Whacking a Job, or Getting rid of an Address Space
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Sam Golob
2017-05-16 13:56:48 UTC
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Hi Folks,

Of course, you're right, Peter. Jobs or STCs are marked
NON-CANCELABLE for a very good reason. Under normal circumstances, they
should not be cancelled, because it would endanger the system. That's
what the PPT is for. Almost always, the safeguards that are there, are
there for a very good reason. And I'm on management's side all the way.
The idea is to keep the systems running as flawlessly and smoothly as
possible.

That having been said, the system doctor sometimes has to deal with
things that go wrong. It's nice when the system is working as
designed. But sometimes, the NON-CANCELABLE job or STC goes awry, and
it has to be restarted. In such a case, as in the middle of a day's
production, you want to avoid an emergency IPL. And so you need a tool
in the toolbox, to cancel the job or STC. Sometimes the only solution
is to blow it away. The expensive multi-utility packages all contain
such tools. You wouldn't criticize Omegamon (TM) or RESOLVE (TM), would
you? But a shop which can't afford to buy them is sometimes stuck, and
is forced to IPL and lose a lot of production time. That's why I wrote
CNCLPG 20 years after I had such an emergency, which I never forgot about.

Systems programmers do not live in an ideal world. Problems come
up, in running the data center, which can be very unforeseen. The
doctor needs to have a scalpel. Most doctors don't often need to use
the scalpel. But when you need it, and nothing else works, it's nice to
know that it is there, sitting in the toolbox. This is where I come
from. It's all for the purpose of keeping the shop running smoothly.

Thanks for listening. All the best of everything to all of you.

Sincerely, Sam

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Tom Marchant
2017-05-16 15:09:45 UTC
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Post by Sam Golob
the system doctor sometimes has to deal with
things that go wrong.
The
doctor needs to have a scalpel. Most doctors don't often need to use
the scalpel.
Sometimes the "doctor" isn't really a doctor, but a boy scout who may
have learned some rudimentary first aid.

And sometimes that thing that he thought was a scalpel is really a
chain saw.
--
Tom Marchant

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Rivera, Dan
2017-05-16 15:18:11 UTC
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..and sometimes a Doctor uses a Sonic Screw Driver.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-***@LISTSERV.UA.EDU] On Behalf Of Tom Marchant
Sent: Tuesday, May 16, 2017 10:11 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: Re: Re. Whacking a Job, or Getting rid of an Address Space
the system doctor sometimes has to deal with things that go wrong.
The
doctor needs to have a scalpel. Most doctors don't often need to use
the scalpel.
Sometimes the "doctor" isn't really a doctor, but a boy scout who may have learned some rudimentary first aid.

And sometimes that thing that he thought was a scalpel is really a chain saw.

--
Tom Marchant

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Walt Farrell
2017-05-16 15:39:04 UTC
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Post by Sam Golob
That having been said, the system doctor sometimes has to deal with
things that go wrong. It's nice when the system is working as
designed. But sometimes, the NON-CANCELABLE job or STC goes awry, and
it has to be restarted. In such a case, as in the middle of a day's
production, you want to avoid an emergency IPL. And so you need a tool
in the toolbox, to cancel the job or STC. Sometimes the only solution
is to blow it away.
However, you should be prepared, when you use the tool, to have to IPL anyway. And that should be clearly stated in any documentation for the tool.
--
Walt

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Edward Gould
2017-05-16 20:28:42 UTC
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Post by Walt Farrell
Post by Sam Golob
That having been said, the system doctor sometimes has to deal with
things that go wrong. It's nice when the system is working as
designed. But sometimes, the NON-CANCELABLE job or STC goes awry, and
it has to be restarted. In such a case, as in the middle of a day's
production, you want to avoid an emergency IPL. And so you need a tool
in the toolbox, to cancel the job or STC. Sometimes the only solution
is to blow it away.
However, you should be prepared, when you use the tool, to have to IPL anyway. And that should be clearly stated in any documentation for the tool.
--
Walt
—————————SNIP———————————

In the early days of MVS we had constant issues of jobs going non cancelable.
Our IBM SE wrote a super cancel (callrtm) command.
We *WERE* using it sparingly. It was a last grasp to IPL.
Although most of our issues had to due with allocation (Q4) getting hung.
We were IPLing once or twice in 3 days (sometimes as many as 8).
IBM rewrote allocation and just about eliminated the need for it. We did still use it from time to time and it did save IPL’s.
Our other IBMer who worked behind mountains of standalone dumps was used to it and didn’t raise it as an issue.
But it was understood by the group that using it was a last gasp attempt and then only making sure there were no allocation hangups.

Ed

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Sam Golob
2017-05-17 15:35:33 UTC
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Hi Folks,

I just wish to thank all the contributors to this thread. I feel
that every single contribution added to our general knowledge. Thank
you all.

This is what the IBM-Main forum is all about.

All the best of everything to all of you.

Sincerely, Sam

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