Also see the PR/SM Planning Guide which has a good discussion called "Capping in a single logical partition".
---start quote In order to use capping for an LP on a CPC where there is a need for only one active LP using shared CPs, you must define and activate a second dummy LP. The dummy LP must also be defined as using shared CPs. The weights of the two LPs can be adjusted to attain the desired cap for the one LP that will actually be used. ---end quote thanks Peter On Wed, 3 Nov 2010 17:59:39 +0800, Cobe Xu <cob...@gmail.com> wrote: >Hi list, >We aim to cap the only active LPAR on the CEC(26 MSU) to 24 MSU. >But, I'm a bit confuse when I checked the RMF CPU Activity report as below, >which shows that with the interval, SYS2 was able to use up to 25 MSU. >(Highlighted) >So my questions are: >1. Is this because CPU capping is not working for only one active LPAR on >the CEC? If it's the case, any reference? >2. Or, this is related to the WEIGHT value we used to CAP? in our case, we >reference our CEC capacity is 26 MSU (about 171 MIPS), target to CAP 24 MSU >(160 MIPS). >. But, for client's sake, we use MIPS value as the WEIGHT,i.e 160. (as >highlighted in the report). And, this mislead the Lpar scheduler that it is >over 100% of the CEC. Thus, > SYS2 can use as much as it needs. >3. Or any other posibility? >Pls shed some light, thanks a lot! > > > >PAGE 2 > z/OS V1R8 SYSTEM ID SYS2 START >08/17/2010-03.00.00 INTERVAL 000.59.59 > RPT VERSION V1R8 RMF END >08/17/2010-04.00.00 CYCLE 0.100 SECONDS > > >MVS PARTITION NAME SYS2 NUMBER OF PHYSICAL >PROCESSORS 4 GROUP NAME N/A >IMAGE CAPACITY 24 >CP 2 LIMIT N/A >NUMBER OF CONFIGURED PARTITIONS 5 >ICF 2 >WAIT COMPLETION >NO > >DISPATCH INTERVAL >DYNAMIC > >--------- PARTITION DATA ----------------- -- LOGICAL PARTITION PROCESSOR >DATA -- -- AVERAGE PROCESSOR UTILIZATION PERCENTAGES -- > ----MSU---- -CAPPING-- PROCESSOR- ----DISPATCH TIME >DATA---- LOGICAL PROCESSORS --- PHYSICAL PROCESSORS --- >NAME S WGT DEF ACT DEF WLM% NUM TYPE EFFECTIVE >TOTAL EFFECTIVE TOTAL LPAR MGMT EFFECTIVE TOTAL >SYS2 A 160 0 25 YES 0.0 2 CP 01.55.49.238 >01.55.53.278 96.52 96.57 0.06 96.52 96.57 >SYS6 A 10 0 0 YES 0.0 2 CP 00.00.00.000 >00.00.00.000 0.00 0.00 0.00 0.00 0.00 >*PHYSICAL* >00.00.01.367 0.02 0.02 > ------------ >------------ ------ ------ ------ > TOTAL 01.55.49.238 >01.55.54.645 0.08 96.52 96.59 > > >CFP01AH2 A DED 1 ICF 00.59.59.655 >00.59.59.725 99.99 99.99 0.00 50.00 50.00 >CFP02AH2 A DED 1 ICF 00.59.59.666 >00.59.59.708 99.99 99.99 0.00 50.00 50.00 >*PHYSICAL* >00.00.00.422 0.01 0.01 > ------------ >------------ ------ ------ ------ > TOTAL 01.59.59.321 >01.59.59.855 0.01 99.99 100.0 > > >SYS8 >-- >Cobe Xu > >Best Regards >----------------------------------------------------------- >zOS Performance & Capacity Analyst >E2E Performance Analyst >Email: cob...@gmail.com >----------------------------------------------------------- > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO >Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
