On Thu, 11 Oct 2007 11:26:44 -0400, Thomas H Puddicombe <[EMAIL PROTECTED]> wrote:
> >managed by IRD - which can and will (and does) fiddle with the number of >online LPs in the various LPARs. > >The logical:physical ratio is not a constant, it's become a variable. > Correct. It will try to be efficient. Which means not allocating more than is needed to get the work done based on the current weight. If you don't set the mins too high, your not going to see 5 LPs on an LPAR that is 5% busy (well you could... IRD will allow the sub-optimal overhead if there a free CPC capacity). >How do IFL, zAAP and zIIP factor into the logical:physical ratio? > First... specialty engines aren't managed by IRD - but the ROTs are the same. But you bring up a good point. There are probably lots of shops that purchased a single zIIP or zAAP and are sharing it between many LPARs. So the ratio could be 3:1, 4:1, 5:1 or higher. But if there is very little work for the zIIP/zAAP to do, the overhead is acceptable. 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 and OS390 expert at http://searchDataCenter.com/ateExperts/ 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
