On Wed, 9 Feb 2011 09:04:27 -0500, Haynes, Stan <[email protected]> wrote:
>We run a 4-system production sysplex using z/OS/JES2 1.11 augmented by Thruput Manager. > >As a result of an application area reporting one of their critical jobs abending S822 (issue since corrected), we found ourselves noticing a very old parm value: default REGION size for all classes via the JOBCLASS statement. It's still set to an 'ancient' value of 7M! Haven't assessed how many of our jobs simply accept the default, but I'm thinking of changing the default region size for all jobclasses to a more current value of 32M. In this day and age, not sure how many programmers have a handle on "used virtual storage", and not sure it should still matter! Jobs simply shouldn't fail because of "region size" in this day and age IMHO. > >I don't know how other shops handle this, and would like to read your comments/thoughts/opinions on my suggested "new" default region size. > Assuming you don't have an IEFUSI exit in place, you wouldn't be gaining much by changing the default to 32M. The default above the line region is already 32M. You would probably gain 2M below the line, maybe 3M and that could help some batch jobs that aren't using REGION greater than 7M today and would abend if they needed more. See the MVS JCL Reference for more detail and you may want to read this article I wrote for TSO times about 7 years ago: Region Size: What You See is Not What You Get http://www.tsotimes.com/articles/archive/spring04/TSO-Times-Spring04.pdf The best thing to do would be to implement an IEFUSI and just ignore what is set in JES2 or (most) JCL for the defaults. Regards, Mark -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
