Thanks to you all for your thoughts and good advice so far!* * Horst, *Re. you saying: (IMHO the term "overhead" is misleading, 'management time' would be more accurate).*
What do you mean by this? Simply stated: overhead is all wat is NOT 'captured' on some application or sw component. LPAR Mgt time for example *is* reported. So, what are you having in mind? Work Load Mgr ? (your beloved 'baby' ;-) ) Jan On Thu, Feb 21, 2013 at 5:21 PM, Horst Sinram <[email protected]> wrote: > Jan, > > it appears the monitor is trying to tell you that you have a low "capture > ratio". Searching for that term should give you a good understanding of > what the message really means, and in a lot of good advice, e.g. in the > "Effective zSeries Performance Monitoring Using Resource Measurement > Facility" publication. (IMHO the term "overhead" is misleading, 'management > time' would be more accurate). > If you believe there might be a problem you may want to start with > verifying LPAR configuration and IEAOPTxx settings (any obscure timing > parameters? Anything violating recommendations?). You could also verify > that the capture ratio is indeed low using SMF70/72 data. > > Phantom weight is irrelevant in this context. It is only a vehicle to tell > PR/SM how to cap the partition. The fact that the LPAR *is* capped at that > time (to what extent?) may very well be relevant, though: More work, longer > work queues... > CPUMF counters won't help you diagnosing anything. CPUMF sampling could > help -theoretically- but the data may be very hard to evaluate. > > Horst Sinram - IBM z/OS Workload Management > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN > ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
