What version of z/OS are you running?
You might want to review the following redbooks. These Redbooks have valuable information to help you work out this process. System z Parallel Sysplex Best Practices http://www.redbooks.ibm.com/abstracts/sg247817.html?Open Effective zSeries Performance Monitoring Using Resource Measurement Facility http://www.redbooks.ibm.com/abstracts/sg246645.html?Open Parallel Sysplex Performance Healthcheck Case Study: DMData/Danske Data http://www.redbooks.ibm.com/abstracts/sg245373.html?Open z/OS Parallel Sysplex Configuration Overview http://www.redbooks.ibm.com/abstracts/sg246485.html?Open OS/390 Parallel Sysplex Configuration, Volume 1: Overview http://www.redbooks.ibm.com/abstracts/sg245637.html?Open OS/390 Parallel Sysplex Configuration, Volume 2: Cookbook http://www.redbooks.ibm.com/abstracts/sg245638.html?Open OS/390 Parallel Sysplex Configuration, Volume 3: Connectivity http://www.redbooks.ibm.com/abstracts/sg245639.html?Open As others will point out, high CPU is not necessarily an issue. There are many factors that need to be reviewed to determine if you have an issue. 1) When does High CPU occur? Is it consistent? - Does it always occur at the same time with the same workload? 2) What workload is running (STCs, TSO, Batch) when this occurs? 3) How do the Page datasets look? (D ASM) 4) Are there any SLAs missed? Are there user complaints? 5) What does RMF or any other monitoring tool show at the time of High CPU? 6) How much real storage is on the CPU? How is it configured between the LPARs? 7) If LPAR B has high CPU does it impact LPAR A. And if LPAR A has high CPU does it impact LPAR B? 8) Are you using SOFT CAP or HARD Cap on the LPARs? There are many other questions that could be asked. This is not a quick and easy analysis. The Redbooks above can help start your understanding of how to look at the system to determine if there is an issue. I hope this helps. Lizette > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[email protected]] On > Behalf Of Meenakshi, Vinoth - CW > Sent: Thursday, September 18, 2014 12:38 AM > To: [email protected] > Subject: High CPU Utilized > > Hi All, > > In environment we are using 2818-X02 box with around 1100 MIPS and this boxes > is utilized by couple of LPARS(SYSP & SYST). One is a PROD and other is Play > LPAR and almost 90% of weight is contributed to PROD SYSP system. > We have a scenario of High CPU utilized only during our batch window(4hours) and > few days back the system was recycled due to the high CPU utilized and we feel > that this may create impact during Peak season in November, December. > Also we got a report from our batch team and most of batch jobs are using more > CPU time with very high elapsed time and below is for your ref. > > JOB NAME CPU TIME ELAPSED TIME > Job A 29:22.1 01.48.26.24 > Job B 19:12.3 02.44.26.24 > > We are position to bring down the CPU Utilization time and make the system > healthy and we are trying to split the Batch jobs and run on different time. > I would like to get some clarity on the Elapsed time, whether this elapsed will make > use of the CPU and will it be the cause of high CPU utilized during batch window? > Kindly clear me. > > We value your valuable inputs and that would be helpful and please suggest is there > any other way to rectify this issue. > > Thanks, > Vinoth M > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
