Lizette, I cannot answer *what* to monitor, other than doing a D OMVS,L to see your current use, highwater use, and limit for it. We now run with MAXMMAPAREA(128000) due to a OEM DB2 change data capture product that reads its config files into memory, and when I had this value set to low the product, and any admins that would access the product through their interface would abend. I was originally set at IBM default, and had to gradually keep incrementing it up over time to where we are now. We have not seen any negative fallout, but not know *where* to look is a bit daunting....
So that's a 128K page dataspace which translates into a highwater mark of 500M, but that is system-wide, not per user. According to the doc, the space isn't allocated and then only incrementally, until used. Our use of the CDC product has tapered off somewhat, so I may reduce this back to 64000. RESPONSE=DEV1 BPXO051I 15.04.07 DISPLAY OMVS 071 OMVS 0011 ACTIVE OMVS=(NF) SYSTEM WIDE LIMITS: LIMMSG=NONE CURRENT HIGHWATER SYSTEM USAGE USAGE LIMIT MAXPROCSYS 365 409 1000 MAXUIDS 66 73 200 MAXPTYS 0 1 800 MAXMMAPAREA 33638 33638 128000 _________________________________________________________________ Dave Jousma Mainframe Engineering, Assistant Vice President david.jou...@53.com 1830 East Paris, Grand Rapids, MIĀ 49546 MD RSCB2H p 616.653.8429 f 616.653.2717 -----Original Message----- From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Behalf Of Lizette Koehler Sent: Wednesday, December 5, 2018 1:24 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Setting MAXMMAPAREA **CAUTION EXTERNAL EMAIL** **DO NOT open attachments or click on links from unknown senders or unexpected emails** Just a quick question. What might be the impact of increasing this OMVS limit from 40,000 to 120,000 What areas of OMVS or z/OS do I need to monitor to make sure "bad things" do not happen Thanks Lizette Koehler "Nothing in life is so exhilarating as to be shot at without result." - Winston Churchill ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN **CAUTION EXTERNAL EMAIL** **DO NOT open attachments or click on links from unknown senders or unexpected emails** This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN