Hi Andrew, they are old fashioned since most customers don't need them. This is nothing you will find in a book clearly stated but that's my truth :-). Let me try to explain why. Most customers (I do WLM optimization - and cost reduction-projects in Germany and Switzerland) have most of their batch workload running during night. And, most of the jobs (from the MSU consumption perspective) are running in one Serviceclass. Hence it makes no sense to have x periods because you have very less MSU consumption in other, higher Serviceclasses. WLM has nothing to prioritize between several Serviceclasses. 2 Periods only make sense in TSO in my eyes for example. The same is true during day there you have your online workload which is and should be higher prioritized. If you Online goals are right your Batch will get less CPU or no CPU it depends.
Hope this helps you. Regards, Uwe -----Ursprüngliche Nachricht----- Von: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] Im Auftrag von Andrew Rowley Gesendet: Dienstag, 1. Mai 2012 13:39 An: IBM-MAIN@bama.ua.edu Betreff: WLM : multiple periods not recommended for batch - why? Hi, I have read a few articles that say that multiple periods are not recommended for batch service classes. Multiple periods seems to be considered a bit old fashioned. I haven't been able to find anything clearly explaining why. I have always felt that they worked well. My best guess is that it is something to do with the behaviour of WLM managed initiators but I'm not sure. Can anyone shed any light, or point me to some further reading? Thanks Andrew Rowley -- Andrew Rowley Black Hill Software Pty. Ltd. Phone: +61 413 302 386 EasySMF for z/OS: Interactive SMF Reports on Your PC http://www.smfreports.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: INFO IBM-MAIN
