Useful references IBM White paper WP100925, "Managing CPU-Intensive Work on Uniprocessor LPARs" by Kathy Walsh 2006
http://www-03.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100925 Managing Workloads on a Uniprocessor by Linda August 2007 http://regions.cmg.org/regions/ncacmg/downloads/mar082007_session2.pdf or http://www.share.org/EventDocuments/tabid/323/Default.aspx?document=proceedings/SHARE_in_Tampa_Bay/S2524LA084813.pdf Today we also don't let LPARs run with one processor (VARYCPUMIN= in IEAOPTxx where we have IRD managing engines). We have to figure out what we will be doing as we replace our smallest CEC with a z10 for the smallest LPARs as well. Thanks, Sam Knutson (GEICO) -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of Flemming Sigvardt Sent: Tuesday, September 23, 2008 6:22 AM To: [email protected] Subject: Setting up PR/SM for very small Capacity LPARs on Fast Processors Hi. I'm working with migrating a customer to z9 hardware, and when it comes to the PR/SM setup I have a few questions, which pops up from time to time I believe. When it comes to assignning Logical Processor to an LPAR, do we still have a ROT of 2:1 ratio between Logical and Physical Processors on the CEC, - or has the PR/SM overhead been minimized over time. Another thing : Way back we didn't assign just 1 LP to an LPAR regardless of how small the LPAR was, - to come around the problems arising with looping applications on an LPAR with just 1 LP. But we are discussing whether or not it's appropriate with z9 to assign 2 LP to a small Capacity LPAR, and keep the utilization of these under - say 3%. Any comments on these issues would be appriciated. Thanks in advance Med venlig hilsen / Kind regards Flemming Sigvardt ------------------------------------------------------------------------------ IBM, IT Delivery, Denmark Borupvang 1, DK-2750 Ballerup Office : (+45) 4523 8467 / Cell : (+45) 2880 8467 Email : [EMAIL PROTECTED] ------------------------------------------------------------------------------ Medmindre andet er angivet ovenfor: / Unless Otherwise Stated Above: IBM Danmark A/S Nymøllevej 91 2800 Kongens Lyngby, Danmark CVR nr.: 65305216 ---------------------------------------------------------------------- ==================== This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution of this email/fax is prohibited. If you are not the intended recipient, please destroy all paper and electronic copies of the original message. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
