The default region size above the line when specifying a size below 16MB is 32MB. When you specify a region size greater than 16MB then you are allowed as much of the private as is available below the line and whatever you specified above the line (assuming there are no exits in place to override this).
As to the limit, you may be able to type in a number that large (2GB) but you are limited to the size of the private area above the line, minus the SWA/LSQA. The private region above the line is limited to 2GB minus the CSA / MLPA / PLPA / SQA / Read/Write Nuc / Read-only Nuc / 16MB (below the line). As an example I have one system with an 820MB extended CSA, so the total extended common area is 935MB, leaving 1,097MB for the extended private and then you have the SWA/LSQA (private area above the line from the top down). I currently default the region size above the line to 128MB which works in most cases. As to the limit of 2091628 KB you will never be able to specify a number close to this as you will require more than 1024KB for the extended common area. I hope this helps. Bruce -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Erik Janssen Sent: Tuesday, June 29, 2010 10:08 AM To: IBM-MAIN@bama.ua.edu Subject: TSO region size Hello List, We are standardising our default TSO region sizes on 64MB since we start seeing more and more problems with programs abending, because people still have 4MB region size as a default. 64MB seemed like a reasonable value to solve some of the issues and not introduce any new. Testing the changes I noticed when I log on to TSO the help panel says that the maximum possible region size is 2096128. This is 1 MB less than 2 GB, which would be 2097152. Can somebody tell me why the max is not exactly 2GB? Regards, Erik Janssen. ----------------------------------------------------------------- ATTENTION: The information in this electronic mail message is private and confidential, and only intended for the addressee. Should you receive this message by mistake, you are hereby notified that any disclosure, reproduction, distribution or use of this message is strictly prohibited. Please inform the sender by reply transmission and delete the message without copying or opening it. Messages and attachments are scanned for all viruses known. If this message contains password-protected attachments, the files have NOT been scanned for viruses by the ING mail domain. Always scan attachments before opening them. ----------------------------------------------------------------- ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ******************** NOTICE OF CONFIDENTIALITY This communication including any information transmitted with it is intended only for the use of the addressees and is confidential. If you are not an intended recipient or responsible for delivering the message to an intended recipient, any review, disclosure, conversion to hard copy, dissemination, reproduction or other use of any part of this communication is strictly prohibited, as is the taking or omitting of any action in reliance upon this communication. If you receive this communication in error or without authorization please notify us immediately by return e-mail or otherwise and permanently delete the entire communication from any computer, disk drive, or other storage medium. If the above disclaimer is not properly readable, it can be found at www.td.com/legal AVERTISSEMENT DE CONFIDENTIALITE Ce courriel, ainsi que tout renseignement ci-inclus, destiné uniquement aux destinataires susmentionnés, est confidentiel. Si vous n'êtes pas le destinataire prévu ou un agent responsable de la livraison de ce courriel, tout examen, divulgation, copie, impression, reproduction, distribution, ou autre utilisation d'une partie de ce courriel est strictement interdit de même que toute intervention ou abstraction à cet égard. Si vous avez reçu ce message par erreur ou sans autorisation, veuillez en aviser immédiatement l'expéditeur par retour de courriel ou par un autre moyen et supprimer immédiatement cette communication entière de tout système électronique. Si l'avis de non-responsabilité ci-dessus n'est pas lisible, vous pouvez le consulter à www.td.com/francais/legale ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html