Is there any specific reason why you would want to first collect the monitor data using MONWRITE, and only then run the analysis in batch mode? One would usually let PerfKit collect the data in real time and just let it print whatever reports you're interested in for the periods you want the data for.
As you've found the size of the monitor data file can grow fast, especially if you have lots of DASD and/or users. If you run PerfKit the MONDATA report will tell you which record types account for most of the space. Basically you can reduce the space requirements by - Disabling monitor domains that are not needed for the reports you're interested in. For just general CPU and storage reports you only need data from the SYSTEM and STORAGE sample domains. Be aware, however, that you cannot disable monitor domains just for MONWRITE's benefit: if you also have a monitor running in real time mode, it will be left with the same reduced set of monitor data, and so won't be able to report on users' or DASD performance once you disabled the USER and I/O sample domains .. - Since only sample data is needed, you can further reduce the number of records collected by increasing the length of the monitor sample interval from the default 60 seconds to 5 or 10 minutes. This will reduce the granularity of the data and is not usually recommended if you need to analyze a performance problem, but it will not impair the accuracy of the data and so is ok if you just need statistical information about system load. But again: why not just let PerfKit collect and print the data in real time mode? Eginhard Jaeger ----- Original Message ----- From: Hamilton, Brian To: IBMVM@LISTSERV.UARK.EDU Sent: Thursday, November 01, 2007 3:01 PM Subject: Controlling MONWRITE and the size of its 191 disk Hello, I'm using Performance toolkit and would like to use the batch interface. I've set up the Performance toolkit batch commands however my problem now is the MONITOR DATA file. The size of the file grows quickly, it about 1 hour the file consumes 90 cyls.. My goal is to collect the data on a ongoing basis, at least for a few days. Any help on setting the size of MONWRITE's 191 disk and a method to keep a few days worth of data would be appreciated. For now I want to monitor CPU and Storage usage. Thanks Brian
