As for monitoring use SMF 71 (RMF Paging Activity) data, most especially MINIMUM as well as AVERAGE Available Frame Count. Study how they both behave with time and how the Minimum deviates from the Average.
That's what Dave Betten and I do in every engagement. And Dave probably has some choice words on how to manage DFSORT use of memory - which often accounts for the difference. One thing I would say is: Understand how your choices help or hinder your ability to add memory to LPARs - whether the one it's allocated to or a different one that subsequently needs it. This, to me, is still not an exact science. I would argue the instrumentation (again SMF 71) could be better in this area. Cheers, Martin Martin Packer, zChampion, Principal Systems Investigator, Worldwide Cloud & Systems Performance, IBM +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker From: "Rugen, Len" <rug...@missouri.edu> To: IBM-MAIN@LISTSERV.UA.EDU Date: 12/02/2016 22:40 Subject: Re: Real Storage Allocation Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> I'd say it depends on your workload :-) If you are doing I/O that could be avoided with more buffers, it would be used. Sort might be able to use it, if you sort much. I once did amazing things increasing CICS temp storage buffers :-) Len Rugen University of Missouri Division of Information Technology Systems & Operations - Metrics & Automation Team ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of phil yogendran [philyo...@gmail.com] Sent: Friday, February 12, 2016 4:07 PM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Real Storage Allocation Hello, Is there a downside to over-allocating real storage on an LPAR? We will be upgrading current processors which are tired and soon to be out of service to z13's which will have 4 times the storage we have at present. We don't have any issues with paging or UIC etc. but I feel that on the new processors, I need to make use of most if not all that available storage. Some of my thoughts are; - Will the additional storage be used on an LPAR which already has enough to do it's work. - Is there a way to monitor for 'unused' storage? - If the storage is not used, is there a loss of cycles in an 'overhead' to managing this unused storage? - etc. Your comments will be appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
