The answer is, "it depends". First, there is no "priority" across LPARS. All LPARS are dispatched "equally" according to the LPAR weights.
For example, if LPARA is weighted are 80 and LPARB is weighted at 20, the following occurs: If LPARA wants 85% and LPARB wants 10% (total 85%) everybody is happy and goes on their merry way. If LPARA wants 85% and LPARB want 20% (total 105%) LPARB will get 20% and LPARA will be squeezed to 80%. If LPARA wants 50% and LPARB wants 40% (total 90%) everybody is happy and goes on their merry way. The LPARA weight represents a "guaranteed minimum" proportion (note: LPAR weights need not total to 100. The proportion is relative.) All of the above occurs when capping (either hard or soft) is not present. Software capping can occur with resource groups. Hardware capping can occur with group capacity limits. This is a complex subject and much more than can be covered in a short e-mail. If you have not already done so, I suggest you obtain a copy of and read the PR/SM Planning Guide. The most recent version I can find is SB10-7155-01 and is located here: https://www-304.ibm.com/support/docview.wss?uid=isg202e537c11be0929c8525776100663570&aid=1 (watch the wrap). RMF Monitor I (batch) has an excellent CPU report. This will also include the "PARTITION DATA REPORT". I will refer you to the fine manuals for details/ WLM *may* reach across LPAR Boundaries. If fact, it is designed to do this. However, if the DVLP lpar is not in the same SYSPLEX, WLM cannot be a factor. As others have pointed out, what evidence is there that the "runaway" task is affecting "production" (factual, not conjecture!)? HTH, <snip> We have a situation with multiple LPARS on a CEC, running DB2 asids prod, test, dev. It is claimed a runaway DB2 DIST asid on the DVLP LPAR is burning CPU and stealing MIPS from the PROD LPAR and affecting production. Others claim this is not possible due to Prism. Will someone provide an overview of how Prism influences or controls MIPS usage (CPU) across LPARs sharing the same CEC, what are the limiting or controlling factors (if any), and how can the behavior be measured or reported upon so I can explain this with supporting doc? Does WLM play a part in sharing CPU across LPARs? </snip> ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
