Re: REGION=0M and LSQA

So what is an ISV to do with a customer that does not use IEFUSI, or
does so incorrectly?
Educate the customer?

If the customer does not use IEFUSI and did not specify any region parm in the jes deck and does not use iealimit, then all the IBM defaults are taken. Meaning: If you specify region=0M, you get region=0M.

Imagine the rude awakening of same customer when an STC with region=4M in the job card (and nowhere else) terminates after a conditional getmain, of course without giving any diagnostic other than 'I'm out of storage', and all that after ECSA had been increased, and not increased by much! I couldn't even get a dump to see *why* the product terminated. Turned out it overwrote LDA in exactly the manner you descibed, but also giving itself everything above the line. (remember, for region=4M and all defaults there *should* be 4M below and 32M above and that's it).

We ended up re-IPLing (and of course running the danger of going out of ECSA again with the next IPL).

On the other hand, if a customer uses IEFUSI (and even incorrectly uses it), you can always say that the product needs x amount below and y amount above and they should really give it that much.

I have seen enough cases where lowering the region limits below by even 2MB to leave room for LSQA wasn't enough, most definitely not for several abends with several RTM2WAs.

If you want to be able to handle load below, better put most of your code and all of your buffers above the line, just so you have space for the system.

In my opinion, if IEFUSI doesn't give an STC what it needs and it is *clearly documented* that the need is there, then the customer and not the vendor is to blame. And yes, the product should terminate after giving the needed data to determine the cause.

'nuff said.
Regards, Barbara Nitz
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