I am trying to increase my TSO region size (currently 4096) so that I can work with JAVA and OMVS (installing a product that requires answers to prompts, so I can't use BPXBATCH). I get "LOGON FAILED" message when I attempt a larger region size, no other information given. I am on page 77 of TSO Customization manual stating TSO/E search order for region size and IKJEFLD exit described in chapter 8. I have already increased my RACF MAXREGION. It appears that I must code the logon pre-prompt exit IKJEFLD to increase my region? Does any one have experience with this, there must be an easier way. Thanks in advance, Martin Wickenden
What does specifying an 8 Meg (8192K) TSO Logon Region Size mean?
It does Not mean you get an 8 Meg region size. Nice guess, and a funny idea, but no. For that matter, REGION=8M in JCL doesn't get you 8 Meg there, either. Hasn't done so for decades (despite what you may have heard or read elsewhere. If you have trouble believing this, feel free to skip down a few paragraphs, where you can find a link to some IBM doc on the matter.)
No, your region size defaults to at least 32 Meg, regardless of what you specify.
Despite the omnipresent threat that the people who set up your own particular z/OS system might have changed the IBM defaults there, or (who knows) might even have vindictively limited your own personal userid — For this discussion, we're assuming you're using a more or less intact z/OS system with the IBM defaults in effect.
So, you ask, What happens when you specify Size 8192 at Logon?
Size ===> 8192
When specifying Size=8192, you will be allowed to use up to 32 Meg of 31-bit addressable memory. This is the ordinary kind of memory that most programs use. You will get this for any value you enter for Size until you get up to asking for something greater than 32 Meg. Above 32 Meg, the Size will be interpreted differently.
If you enter a number greater than 32 Meg (Size ===> 32768), that will be interpreted in the way you would expect – as the region size for ordinary 31-bit memory.
Thanks very much for all your help. I was able to increase region size to 64000 by increasing in RACF TSO segment and specifying on the LOGON screen. This forum is very helpful, best wishes, Martin Wickenden