Search390.com Expert Question of the Week June 4, 2001 Welcome to Search390's Expert Question of the Week newsletter. Remember, no question is too simple for Ask the Experts! If you have a 390-related question, send it to [EMAIL PROTECTED] Selected questions will be answered by our experts. This week's question was answered by Mark Zelden, search390's OS/390 Systems Programming expert. ===================================== GET THE INFO YOU WANT TODAY What do YOU want in your e-mailbox? How about FREE info and offers about computers, networking, wireless devices, finance and lots more? Visit http://search390.techtarget.com/postmasterDirect/, choose the topics that interest you, and you'll get the e-mail you want. ===================================== ======================================================== ENTER TO WIN A PALM Vx! ======================================================== Got a great tip? Share it with us, and you could win a cool prize. Search390 is offering a prize to the user-submitted tip that receives the highest rating each month. The winner of this month's tip contest will receive a Palm Vx ultra slim handheld. Weighing in at just four ounces, the Palm Vx has the same anodized aluminum exterior and LCD screen as the Palm V handheld, yet it has four times the memory of its predecessor, giving you more speed and more storage. To submit a tip, contact us at mailto:[EMAIL PROTECTED]. For more information and contest rules, click on http://search390.techtarget.com/tipsContest/0,289488,sid10_prz550161_cts550144,00.html ======================================================== Q: When running batch jobs with 0M coded I get out-of-storage abends (x0a,x78, etc). When I re-run the same job with 32m coded (job or exec, doesn't matter), the jobs don't abend. Why? Don't both ways give you all the storage <16mb line? A: If the IEFUSI or IEALIMIT exit has not changed anything, then both REGION=0M and REGION=32M will give you all storage below the 16M line. The difference could be above the line storage. REGION=32M will still leave room for above the line LSQA since your above the line private area size is 2048M (2 gigabytes) minus above the line common storage (NUCLEUS, SQA, PLPA, FLPA, MLPA and CSA). In practice this is usually about 1600M-1900M. It is more likely that your installation is modifying what you are getting when you specify REGION=0M with the IEFUSI SMF exit. You may need to talk to local support people to find out. One way you can verify what region size you are actually getting is by using a REXX program avialable from my web site http://home.flash.net/~mzelden/mvsutil.html called REXXSTOR. You can run REXXSTOR as a TSO batch job with different REGION sizes to see what is really available to your job. Here is sample execution JCL: //MYJOB JOB (ACCT),CLASS=A //* //TEST PROC //S1 EXEC PGM=IRXJCL,PARM='REXXSTOR' //SYSTSIN DD DUMMY //SYSTSPRT DD SYSOUT=* //SYSEXEC DD DSN=your.clist.lib,DISP=SHR // PEND //J1 EXEC TEST /* DEFAULT REGION SIZE ABOVE & BELOW - */ //* /* JES2 DEFAULT REGION SIZE FROM JOBCLASS */ //* /* IS USED FOR BELOW SIZE IF NOT OVERRIDEN */ //* /* BY INSTALLATION EXIT */ //J2 EXEC TEST,REGION.S1=8M /* REQ BELOW / ABOVE TEST #1 */ //J3 EXEC TEST,REGION.S1=20M /* MAX BELOW / ABOVE TEST #1 */ //J4 EXEC TEST,REGION.S1=40M /* MAX BELOW / ABOVE TEST #2 */ //J5 EXEC TEST,REGION.S1=80M /* MAX BELOW / ABOVE TEST #3 */ //J6 EXEC TEST,REGION.S1=100M /* MAX BELOW / ABOVE TEST #4 */ //J7 EXEC TEST,REGION.S1=200M /* MAX BELOW / ABOVE TEST #5 */ //J8 EXEC TEST,REGION.S1=500M /* MAX BELOW / ABOVE TEST #6 */ //J9 EXEC TEST,REGION.S1=900M /* MAX BELOW / ABOVE TEST #7 */ //J10 EXEC TEST,REGION.S1=0M /* REGION = 0M TEST */ //J11 EXEC TEST,REGION.S1=14M /* IMPOSSIBLE REGION TEST */ The REXXSTOR exec can also be executed interactivly from your TSO session or from the Unix System Services environment. I've also invoked it from a web browser accessing an OS/390 web server to debug a storage problem. The link in the web page would look something like this: <a href="/cgi-bin/rexxstor">Storage Available to Web Server</a> Additional Resources: * Share your thoughts! What's on your mind? Post your S/390 thoughts, comments, suggestions, and feedback on our search390 discussion forums. Check out our different forum categories at http://search390.techtarget.com/aboutUs/0,289153,sid10_gci546566,00.html ======================================================= What do you think about this Expert Question of the Week? Let us know. Send an email to [EMAIL PROTECTED] ======================================================= ===================================================== What technical issues are important to you? Do you have an idea or a tip you'd like to share with other S/390 pros? Let us know. 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