On Wed, 13 May 2009 07:33:51 -0400, Peter Relson <[email protected]> wrote:
>>PR/SM can use additional engines >>lowering the logical to physical ratio, but MVS only builds enough control >>blocks on for the number of initial engines plus the number of reserved >>engines. > >>This may have been improved with recent releases of z/OS but this was >>certainly an issue in the past. > >As Mark Zelden has correctly commented, z/OS 1.10 supports the z10 >functionality that lets you define to an LPAR a new CPU that was not >reserved and then you can configure it online to z/OS without an IPL. As a >result there are some things you might notice, such as on such a machine >CVTMAXMP not being the actual highest CPU number known at IPL but instead >being the highest CPU number possible for that machine (and, similarly, the >LCCA and PCCA vector tables being of maximum-possible size). There is a new >field that could be of interest (and you might consider changing >applications to use it instead of CVTMAXMP): > >ECVT_Installed_CPU_HWM DC H'0' The highest CPU number currently > installed within this IPL. Could > increase upon dynamic CPU addition > >Applications that allocate storage per-possible-processor and then depend >on that storage being available whenever they find themselves running on >"CPU n", basing that storage allocation upon the value in CVTMAXMP is >usually the right thing to do.. But applications that simply are >"reporting" by looping through possible processors might well do fine using >ECVT_Installed_CPU_HWM. > >Peter Relson >z/OS Core Technology Design Hi Peter, Thanks for that information. My IPLINFO REXX program had been using SCCBNCPS to determine that number. And while IHASCCB was updated for DYNCP (to add SCCBHCPA - Highest possible CPU address), SCCBNCPS does not get updated after IPL. Regards, 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
