Agree: "Achievable" is what's important here. Please measure it - with load.
This is where I struggle without IBM-MAIN being a visual medium. :-) I plot velocity WITH LOAD and see how it droops. My code has done this for years and I present this graphing method regularly - to individual customers as well as at conferences. Drooping tells you most of what you need to know. :-) Of course it's an economic decision whether you let DB2's velocity (really the service class' velocity) falter with load. Or whether a velocity in the 30-40% range is acceptable. So I'm not making an absolute "70%" statement; I merely observe MOST customers achieve 60+, many 70+, some 80+, a few 90+ . One other observation: In the service class that DB2 (notionally "STCHI") I typically see the main "Using" sample being "Using I/O". It's worthwhile establishing this. Of course, if DBM1 is not the "dominant" address space this picture could look quite different. To repeat, slightly altered: It's worthwhile figuring out why "STCHI" has the velocity it has, when it has. Hoping this helps, rather than confusing. In any case it's a great way to slide into a Friday. :-) And I've a feeling Marna and I could do a while podcast episode on just this one topic. :-) Cheers, Martin Martin Packer, zChampion, Principal Systems Investigator, Worldwide Cloud & Systems Performance, IBM +44-7802-245-584 email: [email protected] Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker Podcast Series (With Marna Walle): https://developer.ibm.com/tv/category/mpt/ From: Edward Finnell <[email protected]> To: [email protected] Date: 29/04/2016 01:04 Subject: Re: WLM issue with a proposed solution Sent by: IBM Mainframe Discussion List <[email protected]> Some of the new features in RMF are an improvement into what's happening. SHARE papers and Redbooks give insight into what to look for in the 'buckets'. The Boebligen folks admit Velocity goals are really tough for RMF due to rapidity of changing landscape. Configuration is very important. I'd hang some zIIPs on that puppy for a start. In a message dated 4/28/2016 6:49:39 P.M. Central Daylight Time, [email protected] writes: available (maybe only 1 or 2), in which case a velocity of 70 is probably not achievable. 30 or 40 might be what you realistically get. Perhaps looking at the velocity of SYSSTC might give an idea of the limit of achievable velocity? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] 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 [email protected] with the message: INFO IBM-MAIN
