On Thu, 15 Jan 2009 08:52:21 -0500, Richbourg, Claude <[email protected]> wrote:
>Hello all, > >I would like to know if any of you have this feature turned on and what >benefits have you noticed from it. >We are switching to a z10BC U03 this weekend from a z/890 370 and I am >interested in what experiences any of you have had. Our WLM policy is >okay and I may need to tweak a few areas pending HiperDispatch. > >I am now reading the White Paper (Planning Considerations for >HiperDispatch Mode) so I can get a feel for it. >Any one have any comments good or bad on this? > We had it on but had to turn it off. We are waiting for APAR OA26789 to close. The description of the APAR says "PROCESSOR NOT UNPARKED WHEN LOW WEIGHT PARTITION RUNNING 100%". But I wouldn't call the LPARs we were having problems with "low weight". Basically, the algorithms are too aggressive in the parking of engines and we were not able to drive the CPCs to 100% busy. That is the way we run during peeks (a peek can be most of prime shift depending on the day of the week / month). We rely on "stealing" heavily... especially with sysplexes on the same CPCs in different time zones. The amount of overhead we would save by having it on (2-4% percent perhaps based on our configurations), didn't offset the problems we were seeing (engines parked with MVS busy 100% and spare capacity on the CPC). >From what I understand, OA26789 will be used to make more changes than just what the description says. Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - ZFUS G-ITO mailto:[email protected] z/OS Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- 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
